Source: snapvoip.blogspot.com

VoIP IP Telephony @ http://snapvoip.blogspot.com via eMediawire.
Two competing open source projects have now been compared in a side by side test. SIP Express Router, also known as SER (www.iptel.org), is the respected pioneer of open source SIP proxies. SER has been available since November 2003 and has a reputation for high performance and reliability. The upstart, OpenSER (www.openser.org) was created when developers disappointed by SER’s slow release schedule, forked a version of SER to create OpenSER in June 2005.
Ever since, SIP proxy users have been faced with the question, which project is best?

TransNexus, an independent developer of VoIP Operations and Billing Support System (OSS/BSS) software decided to answer this question for its customers once and for all. Most product benchmark test plans are designed to yield incredible results for marketing promotion. The TransNexus benchmark plan was different. It was designed to mimic a production network with a lot of failed call attempts and the added overhead of call detail record collection.

As expected, the TransNexus results were not as amazing as some of the other published test results, but they were realistic and still very impressive. Telecom equipment vendors need to beware, both SER and OpenSER are ready to scale for the largest wholesale carrier operations. To summarize the results, TransNexus found that either OpenSER or SER SIP proxies have the performance to manage 720 calls per second on a $3,000 Linux server with dual Intel Xeon CPUs. For a typical wholesale carrier operation, this performance is sufficient to manage over 700 million minutes of traffic each month! While OpenSER and SER are competing against each other, they are rapidly out running the cost/benefit performance offered by commercial telecom equipment vendors.

Here is What Transnexus had to say;

Performance Results for OpenSER and SIP Express Router

We often hear the questions:

• How fast are OpenSER or SER in a real world environment?

• How do SER and OpenSER compare?

We decided to answer these questions and created a detailed performance test for OpenSER and SIP Express Router. To simulate a production environment, the SIP proxy under test queries an external OSP server for routing information on each and call and then reports call detail records to an external OSP server. Five destinations are returned to the SIP proxy for each call in random order. Four of the five destinations simulate call failure scenarios so the SIP proxy must retry the call an average of two times before the call is completed. These tests were performed on a single core of an Intel Xeon 5140 2.33 GHz CPU.

Here is a brief summary of what transnexus learned. For all the test details, click here.

• The performance of OpenSER V1.2 and SER 2.0 are not materially different, however, there are two minor differences.
  • SER V2.0 requires less memory.
  • OpenSER V1.2 has less post dial delay.

• By all measures, OpenSER V1.2 is significantly better than OpenSER V1.1.

• For production operation (with call retries and CDR reporting), we suggest the following simple guideline for sizing server hardware to operate at 60% CPU utilization for OpenSER V1.2 and SER V2.0:

One GHz of CPU processing capacity can manage 60 calls per second.

For example, a server with two, dual core, 3.0 GHz CPUs would effectively have (2 CPUs * 2 cores * 3 GHz per CPU) twelve GHz of CPU processing capacity. This server, hosting either OpenSER V1.2 or SER 2.0, would be able to manage 720 calls per second at approximately 60% CPU utilization.

CPU Utilization

The following chart plots CPU utilization as a function of calls per second. The results for OpenSER V1.2 and SER 2.0 are identical. The performance of OpenSER V1.2 is 13% better than OpenSER V1.1.

Memory Usage

Memory is not a major resource requirement, even at high loads. SER 2.0 has the lowest memory requirement.

Post Dial Delay

The data on the following chart is an indirect indication of Post Dial Delay (PDD). The data presented is the percentage of calls in each test that experienced a PDD greater than six seconds.

Call Completion

The following chart presents the percentage of calls which were not completed successfully for each test. When CPU utilization was less 90%, both OpenSER V1.2 and SER 2.0 completed all calls successfully.

Source: snapvoip.blogspot.com

If you happened to be on the OPENSER site browse over to the history of openser, you will find that there is no real comparison.
I was a ardent fan of SER and have implemented a few servers using various versions of SER. But I was always wondering about the way the development was traveling, from company to company and IPTEL.ORG site was off line for days. As the OPERNSER article states, Basically I could not count on the project. I was worried about the state of servers I have deployed.
Then I found OPENSER project, installed a test server, verified connectivity that I was using. All were better than before and at that point I converted all my servers one by one to OPENSER. OPENSER behaves very well among the all the itty bitty servers that I have running, Asterisk (versions 1, 1.2 and the latest 1.4), FreeSwitch, and trixbox.
But I do visit the ser site now and then. It seems to be up for most times and there are some activities. I will watch and let you know if there are significant changes. For now choose Openser.
Just for your information, I will state the history of OPENSER here, straight from the site;

OpenSER project started on the 14th June, 2005. That looks as a pretty young project, but actually it is full of history.

Origin of OpenSER started back in 2001-2002, at FhG FOKUS research institute in Berlin, Germany. In autumn 2002, the SIP Express Router (SER) project developed to be used in different European IST projects (e.g., EVOLUTE) was released open source under GPL license and the source tree moved to BerliOS open source mediator site. The home web site of the project was http://www.iptel.org, hosted by FhG FOKUS. The core developers of SER SIP server were: Andrei Pelinescu-Onciul, Bogdan-Andrei Iancu , Daniel-Constantin Mierla , Jan Janak and Jiri Kuthan. Very soon, new contributors joined the project, among early contributors you can find Juha Heinanen , Maxim Sobolev, Elena-Ramona Modroiu, Adrian Georgescu .

The quality and flexibility of the project made it grow rapidly. It was used in other IST projects but it moved in business. Sites like FreeWorldDialup, SipPhone, SipGate, VoIPUser are well known reference points and early adopters of the project.

Unfortunately, at the end of 2004, the evolution of the public project took an undesired direction. FhG Fokus decided to start a spinoff, iptelorg.com Gmbh, that focuses on businesses with SER. Soon after, iptelorg.com Gmbh was sold to Tekelek, which had no intention to continue the development of the public project. The core development team split in two: three of them followed Iptelorg.com Gmbh (Andrei Pelinescu-Onciul, Jan Janak and Jiri Kuthan) and the other two continued with the research institute (Bogdan-Andrei Iancu , Daniel-Constantin Mierla ). After a while, Bogdan-Andrei Iancu and Daniel-Constantin Mierla left the institute and started the OpenSER project in June 2005.

The fork of the project was forced by the obstacles encountered in the collaboration with Iptelorg.com Gmbh. No contributions were accepted, releases were delayed, no interest in project’s development. The team founding OpenSER project was completed with Elena-Ramona Modroiu - a main contributor of SER (xlog, avpops, diameter support, pdt, speeddial).

Other SER contributors joined the project: Juha Heinanen , Klaus Darilion , Adrian Georgescu , Cesc Santasusana , Dimitry Isakbaiev, Andreas Granig. After one year, the project counted over 60 people contributing with code, patches or documentation.

First OpenSER release happened on the 14th June 2005, versioned 0.9.4 - source code forked from SER branch 0.9.0. Since then, other releases were made: 0.9.5 patch update to 0.9.4; 1.0.0 - major release - first open source SIP server with TLS support on the 28th October 2005; 1.0.1 - patch updated to 1.0.0; and last major release at this moment, 1.1.0, on the 10th July 2006.

Links to sites and articles;
VOIP IP Telephony: Asterisk Beta 1.4 by the end of the week and an interview!
OpenSER History
VOIP IP Telephony: Trunk trixboxes (two right now!)
VOIP IP Telephony: FreeSWITCH breaks new ground in VOIP, telephony world!

Source: snapvoip.blogspot.com

If you happened to be on the OPENSER site browse over to the history of openser, you will find that there is no real comparison.
I was a ardent fan of SER and have implemented a few servers using various versions of SER. But I was always wondering about the way the development was traveling, from company to company and IPTEL.ORG site was off line for days. As the OPERNSER article states, Basically I could not count on the project. I was worried about the state of servers I have deployed.
Then I found OPENSER project, installed a test server, verified connectivity that I was using. All were better than before and at that point I converted all my servers one by one to OPENSER. OPENSER behaves very well among the all the itty bitty servers that I have running, Asterisk (versions 1, 1.2 and the latest 1.4), FreeSwitch, and trixbox.
But I do visit the ser site now and then. It seems to be up for most times and there are some activities. I will watch and let you know if there are significant changes. For now choose Openser.
Just for your information, I will state the history of OPENSER here, straight from the site;

OpenSER project started on the 14th June, 2005. That looks as a pretty young project, but actually it is full of history.

Origin of OpenSER started back in 2001-2002, at FhG FOKUS research institute in Berlin, Germany. In autumn 2002, the SIP Express Router (SER) project developed to be used in different European IST projects (e.g., EVOLUTE) was released open source under GPL license and the source tree moved to BerliOS open source mediator site. The home web site of the project was http://www.iptel.org, hosted by FhG FOKUS. The core developers of SER SIP server were: Andrei Pelinescu-Onciul, Bogdan-Andrei Iancu , Daniel-Constantin Mierla , Jan Janak and Jiri Kuthan. Very soon, new contributors joined the project, among early contributors you can find Juha Heinanen , Maxim Sobolev, Elena-Ramona Modroiu, Adrian Georgescu .

The quality and flexibility of the project made it grow rapidly. It was used in other IST projects but it moved in business. Sites like FreeWorldDialup, SipPhone, SipGate, VoIPUser are well known reference points and early adopters of the project.

Unfortunately, at the end of 2004, the evolution of the public project took an undesired direction. FhG Fokus decided to start a spinoff, iptelorg.com Gmbh, that focuses on businesses with SER. Soon after, iptelorg.com Gmbh was sold to Tekelek, which had no intention to continue the development of the public project. The core development team split in two: three of them followed Iptelorg.com Gmbh (Andrei Pelinescu-Onciul, Jan Janak and Jiri Kuthan) and the other two continued with the research institute (Bogdan-Andrei Iancu , Daniel-Constantin Mierla ). After a while, Bogdan-Andrei Iancu and Daniel-Constantin Mierla left the institute and started the OpenSER project in June 2005.

The fork of the project was forced by the obstacles encountered in the collaboration with Iptelorg.com Gmbh. No contributions were accepted, releases were delayed, no interest in project’s development. The team founding OpenSER project was completed with Elena-Ramona Modroiu - a main contributor of SER (xlog, avpops, diameter support, pdt, speeddial).

Other SER contributors joined the project: Juha Heinanen , Klaus Darilion , Adrian Georgescu , Cesc Santasusana , Dimitry Isakbaiev, Andreas Granig. After one year, the project counted over 60 people contributing with code, patches or documentation.

First OpenSER release happened on the 14th June 2005, versioned 0.9.4 - source code forked from SER branch 0.9.0. Since then, other releases were made: 0.9.5 patch update to 0.9.4; 1.0.0 - major release - first open source SIP server with TLS support on the 28th October 2005; 1.0.1 - patch updated to 1.0.0; and last major release at this moment, 1.1.0, on the 10th July 2006.

Links to sites and articles;
VOIP IP Telephony: Asterisk Beta 1.4 by the end of the week and an interview!
OpenSER History
VOIP IP Telephony: Trunk trixboxes (two right now!)
VOIP IP Telephony: FreeSWITCH breaks new ground in VOIP, telephony world!

Source: snapvoip.blogspot.com

If you happened to be on the OPENSER site browse over to the history of openser, you will find that there is no real comparison.
I was a ardent fan of SER and have implemented a few servers using various versions of SER. But I was always wondering about the way the development was traveling, from company to company and IPTEL.ORG site was off line for days. As the OPERNSER article states, Basically I could not count on the project. I was worried about the state of servers I have deployed.
Then I found OPENSER project, installed a test server, verified connectivity that I was using. All were better than before and at that point I converted all my servers one by one to OPENSER. OPENSER behaves very well among the all the itty bitty servers that I have running, Asterisk (versions 1, 1.2 and the latest 1.4), FreeSwitch, and trixbox.
But I do visit the ser site now and then. It seems to be up for most times and there are some activities. I will watch and let you know if there are significant changes. For now choose Openser.
Just for your information, I will state the history of OPENSER here, straight from the site;

OpenSER project started on the 14th June, 2005. That looks as a pretty young project, but actually it is full of history.

Origin of OpenSER started back in 2001-2002, at FhG FOKUS research institute in Berlin, Germany. In autumn 2002, the SIP Express Router (SER) project developed to be used in different European IST projects (e.g., EVOLUTE) was released open source under GPL license and the source tree moved to BerliOS open source mediator site. The home web site of the project was http://www.iptel.org, hosted by FhG FOKUS. The core developers of SER SIP server were: Andrei Pelinescu-Onciul, Bogdan-Andrei Iancu , Daniel-Constantin Mierla , Jan Janak and Jiri Kuthan. Very soon, new contributors joined the project, among early contributors you can find Juha Heinanen , Maxim Sobolev, Elena-Ramona Modroiu, Adrian Georgescu .

The quality and flexibility of the project made it grow rapidly. It was used in other IST projects but it moved in business. Sites like FreeWorldDialup, SipPhone, SipGate, VoIPUser are well known reference points and early adopters of the project.

Unfortunately, at the end of 2004, the evolution of the public project took an undesired direction. FhG Fokus decided to start a spinoff, iptelorg.com Gmbh, that focuses on businesses with SER. Soon after, iptelorg.com Gmbh was sold to Tekelek, which had no intention to continue the development of the public project. The core development team split in two: three of them followed Iptelorg.com Gmbh (Andrei Pelinescu-Onciul, Jan Janak and Jiri Kuthan) and the other two continued with the research institute (Bogdan-Andrei Iancu , Daniel-Constantin Mierla ). After a while, Bogdan-Andrei Iancu and Daniel-Constantin Mierla left the institute and started the OpenSER project in June 2005.

The fork of the project was forced by the obstacles encountered in the collaboration with Iptelorg.com Gmbh. No contributions were accepted, releases were delayed, no interest in project’s development. The team founding OpenSER project was completed with Elena-Ramona Modroiu - a main contributor of SER (xlog, avpops, diameter support, pdt, speeddial).

Other SER contributors joined the project: Juha Heinanen , Klaus Darilion , Adrian Georgescu , Cesc Santasusana , Dimitry Isakbaiev, Andreas Granig. After one year, the project counted over 60 people contributing with code, patches or documentation.

First OpenSER release happened on the 14th June 2005, versioned 0.9.4 - source code forked from SER branch 0.9.0. Since then, other releases were made: 0.9.5 patch update to 0.9.4; 1.0.0 - major release - first open source SIP server with TLS support on the 28th October 2005; 1.0.1 - patch updated to 1.0.0; and last major release at this moment, 1.1.0, on the 10th July 2006.

Links to sites and articles;
VOIP IP Telephony: Asterisk Beta 1.4 by the end of the week and an interview!
OpenSER History
VOIP IP Telephony: Trunk trixboxes (two right now!)
VOIP IP Telephony: FreeSWITCH breaks new ground in VOIP, telephony world!

Source: snapvoip.blogspot.com

If you happened to be on the OPENSER site browse over to the history of openser, you will find that there is no real comparison.
I was a ardent fan of SER and have implemented a few servers using various versions of SER. But I was always wondering about the way the development was traveling, from company to company and IPTEL.ORG site was off line for days. As the OPERNSER article states, Basically I could not count on the project. I was worried about the state of servers I have deployed.
Then I found OPENSER project, installed a test server, verified connectivity that I was using. All were better than before and at that point I converted all my servers one by one to OPENSER. OPENSER behaves very well among the all the itty bitty servers that I have running, Asterisk (versions 1, 1.2 and the latest 1.4), FreeSwitch, and trixbox.
But I do visit the ser site now and then. It seems to be up for most times and there are some activities. I will watch and let you know if there are significant changes. For now choose Openser.
Just for your information, I will state the history of OPENSER here, straight from the site;

OpenSER project started on the 14th June, 2005. That looks as a pretty young project, but actually it is full of history.

Origin of OpenSER started back in 2001-2002, at FhG FOKUS research institute in Berlin, Germany. In autumn 2002, the SIP Express Router (SER) project developed to be used in different European IST projects (e.g., EVOLUTE) was released open source under GPL license and the source tree moved to BerliOS open source mediator site. The home web site of the project was http://www.iptel.org, hosted by FhG FOKUS. The core developers of SER SIP server were: Andrei Pelinescu-Onciul, Bogdan-Andrei Iancu , Daniel-Constantin Mierla , Jan Janak and Jiri Kuthan. Very soon, new contributors joined the project, among early contributors you can find Juha Heinanen , Maxim Sobolev, Elena-Ramona Modroiu, Adrian Georgescu .

The quality and flexibility of the project made it grow rapidly. It was used in other IST projects but it moved in business. Sites like FreeWorldDialup, SipPhone, SipGate, VoIPUser are well known reference points and early adopters of the project.

Unfortunately, at the end of 2004, the evolution of the public project took an undesired direction. FhG Fokus decided to start a spinoff, iptelorg.com Gmbh, that focuses on businesses with SER. Soon after, iptelorg.com Gmbh was sold to Tekelek, which had no intention to continue the development of the public project. The core development team split in two: three of them followed Iptelorg.com Gmbh (Andrei Pelinescu-Onciul, Jan Janak and Jiri Kuthan) and the other two continued with the research institute (Bogdan-Andrei Iancu , Daniel-Constantin Mierla ). After a while, Bogdan-Andrei Iancu and Daniel-Constantin Mierla left the institute and started the OpenSER project in June 2005.

The fork of the project was forced by the obstacles encountered in the collaboration with Iptelorg.com Gmbh. No contributions were accepted, releases were delayed, no interest in project’s development. The team founding OpenSER project was completed with Elena-Ramona Modroiu - a main contributor of SER (xlog, avpops, diameter support, pdt, speeddial).

Other SER contributors joined the project: Juha Heinanen , Klaus Darilion , Adrian Georgescu , Cesc Santasusana , Dimitry Isakbaiev, Andreas Granig. After one year, the project counted over 60 people contributing with code, patches or documentation.

First OpenSER release happened on the 14th June 2005, versioned 0.9.4 - source code forked from SER branch 0.9.0. Since then, other releases were made: 0.9.5 patch update to 0.9.4; 1.0.0 - major release - first open source SIP server with TLS support on the 28th October 2005; 1.0.1 - patch updated to 1.0.0; and last major release at this moment, 1.1.0, on the 10th July 2006.

Links to sites and articles;
VOIP IP Telephony: Asterisk Beta 1.4 by the end of the week and an interview!
OpenSER History
VOIP IP Telephony: Trunk trixboxes (two right now!)
VOIP IP Telephony: FreeSWITCH breaks new ground in VOIP, telephony world!

Source: snapvoip.blogspot.com

If you happened to be on the OPENSER site browse over to the history of openser, you will find that there is no real comparison.
I was a ardent fan of SER and have implemented a few servers using various versions of SER. But I was always wondering about the way the development was traveling, from company to company and IPTEL.ORG site was off line for days. As the OPERNSER article states, Basically I could not count on the project. I was worried about the state of servers I have deployed.
Then I found OPENSER project, installed a test server, verified connectivity that I was using. All were better than before and at that point I converted all my servers one by one to OPENSER. OPENSER behaves very well among the all the itty bitty servers that I have running, Asterisk (versions 1, 1.2 and the latest 1.4), FreeSwitch, and trixbox.
But I do visit the ser site now and then. It seems to be up for most times and there are some activities. I will watch and let you know if there are significant changes. For now choose Openser.
Just for your information, I will state the history of OPENSER here, straight from the site;

OpenSER project started on the 14th June, 2005. That looks as a pretty young project, but actually it is full of history.

Origin of OpenSER started back in 2001-2002, at FhG FOKUS research institute in Berlin, Germany. In autumn 2002, the SIP Express Router (SER) project developed to be used in different European IST projects (e.g., EVOLUTE) was released open source under GPL license and the source tree moved to BerliOS open source mediator site. The home web site of the project was http://www.iptel.org, hosted by FhG FOKUS. The core developers of SER SIP server were: Andrei Pelinescu-Onciul, Bogdan-Andrei Iancu , Daniel-Constantin Mierla , Jan Janak and Jiri Kuthan. Very soon, new contributors joined the project, among early contributors you can find Juha Heinanen , Maxim Sobolev, Elena-Ramona Modroiu, Adrian Georgescu .

The quality and flexibility of the project made it grow rapidly. It was used in other IST projects but it moved in business. Sites like FreeWorldDialup, SipPhone, SipGate, VoIPUser are well known reference points and early adopters of the project.

Unfortunately, at the end of 2004, the evolution of the public project took an undesired direction. FhG Fokus decided to start a spinoff, iptelorg.com Gmbh, that focuses on businesses with SER. Soon after, iptelorg.com Gmbh was sold to Tekelek, which had no intention to continue the development of the public project. The core development team split in two: three of them followed Iptelorg.com Gmbh (Andrei Pelinescu-Onciul, Jan Janak and Jiri Kuthan) and the other two continued with the research institute (Bogdan-Andrei Iancu , Daniel-Constantin Mierla ). After a while, Bogdan-Andrei Iancu and Daniel-Constantin Mierla left the institute and started the OpenSER project in June 2005.

The fork of the project was forced by the obstacles encountered in the collaboration with Iptelorg.com Gmbh. No contributions were accepted, releases were delayed, no interest in project’s development. The team founding OpenSER project was completed with Elena-Ramona Modroiu - a main contributor of SER (xlog, avpops, diameter support, pdt, speeddial).

Other SER contributors joined the project: Juha Heinanen , Klaus Darilion , Adrian Georgescu , Cesc Santasusana , Dimitry Isakbaiev, Andreas Granig. After one year, the project counted over 60 people contributing with code, patches or documentation.

First OpenSER release happened on the 14th June 2005, versioned 0.9.4 - source code forked from SER branch 0.9.0. Since then, other releases were made: 0.9.5 patch update to 0.9.4; 1.0.0 - major release - first open source SIP server with TLS support on the 28th October 2005; 1.0.1 - patch updated to 1.0.0; and last major release at this moment, 1.1.0, on the 10th July 2006.

Links to sites and articles;
VOIP IP Telephony: Asterisk Beta 1.4 by the end of the week and an interview!
OpenSER History
VOIP IP Telephony: Trunk trixboxes (two right now!)
VOIP IP Telephony: FreeSWITCH breaks new ground in VOIP, telephony world!

Source: snapvoip.blogspot.com

If you happened to be on the OPENSER site browse over to the history of openser, you will find that there is no real comparison.
I was a ardent fan of SER and have implemented a few servers using various versions of SER. But I was always wondering about the way the development was traveling, from company to company and IPTEL.ORG site was off line for days. As the OPERNSER article states, Basically I could not count on the project. I was worried about the state of servers I have deployed.
Then I found OPENSER project, installed a test server, verified connectivity that I was using. All were better than before and at that point I converted all my servers one by one to OPENSER. OPENSER behaves very well among the all the itty bitty servers that I have running, Asterisk (versions 1, 1.2 and the latest 1.4), FreeSwitch, and trixbox.
But I do visit the ser site now and then. It seems to be up for most times and there are some activities. I will watch and let you know if there are significant changes. For now choose Openser.
Just for your information, I will state the history of OPENSER here, straight from the site;

OpenSER project started on the 14th June, 2005. That looks as a pretty young project, but actually it is full of history.

Origin of OpenSER started back in 2001-2002, at FhG FOKUS research institute in Berlin, Germany. In autumn 2002, the SIP Express Router (SER) project developed to be used in different European IST projects (e.g., EVOLUTE) was released open source under GPL license and the source tree moved to BerliOS open source mediator site. The home web site of the project was http://www.iptel.org, hosted by FhG FOKUS. The core developers of SER SIP server were: Andrei Pelinescu-Onciul, Bogdan-Andrei Iancu , Daniel-Constantin Mierla , Jan Janak and Jiri Kuthan. Very soon, new contributors joined the project, among early contributors you can find Juha Heinanen , Maxim Sobolev, Elena-Ramona Modroiu, Adrian Georgescu .

The quality and flexibility of the project made it grow rapidly. It was used in other IST projects but it moved in business. Sites like FreeWorldDialup, SipPhone, SipGate, VoIPUser are well known reference points and early adopters of the project.

Unfortunately, at the end of 2004, the evolution of the public project took an undesired direction. FhG Fokus decided to start a spinoff, iptelorg.com Gmbh, that focuses on businesses with SER. Soon after, iptelorg.com Gmbh was sold to Tekelek, which had no intention to continue the development of the public project. The core development team split in two: three of them followed Iptelorg.com Gmbh (Andrei Pelinescu-Onciul, Jan Janak and Jiri Kuthan) and the other two continued with the research institute (Bogdan-Andrei Iancu , Daniel-Constantin Mierla ). After a while, Bogdan-Andrei Iancu and Daniel-Constantin Mierla left the institute and started the OpenSER project in June 2005.

The fork of the project was forced by the obstacles encountered in the collaboration with Iptelorg.com Gmbh. No contributions were accepted, releases were delayed, no interest in project’s development. The team founding OpenSER project was completed with Elena-Ramona Modroiu - a main contributor of SER (xlog, avpops, diameter support, pdt, speeddial).

Other SER contributors joined the project: Juha Heinanen , Klaus Darilion , Adrian Georgescu , Cesc Santasusana , Dimitry Isakbaiev, Andreas Granig. After one year, the project counted over 60 people contributing with code, patches or documentation.

First OpenSER release happened on the 14th June 2005, versioned 0.9.4 - source code forked from SER branch 0.9.0. Since then, other releases were made: 0.9.5 patch update to 0.9.4; 1.0.0 - major release - first open source SIP server with TLS support on the 28th October 2005; 1.0.1 - patch updated to 1.0.0; and last major release at this moment, 1.1.0, on the 10th July 2006.

Links to sites and articles;
VOIP IP Telephony: Asterisk Beta 1.4 by the end of the week and an interview!
OpenSER History
VOIP IP Telephony: Trunk trixboxes (two right now!)
VOIP IP Telephony: FreeSWITCH breaks new ground in VOIP, telephony world!

Source: snapvoip.blogspot.com

If you happened to be on the OPENSER site browse over to the history of openser, you will find that there is no real comparison.
I was a ardent fan of SER and have implemented a few servers using various versions of SER. But I was always wondering about the way the development was traveling, from company to company and IPTEL.ORG site was off line for days. As the OPERNSER article states, Basically I could not count on the project. I was worried about the state of servers I have deployed.
Then I found OPENSER project, installed a test server, verified connectivity that I was using. All were better than before and at that point I converted all my servers one by one to OPENSER. OPENSER behaves very well among the all the itty bitty servers that I have running, Asterisk (versions 1, 1.2 and the latest 1.4), FreeSwitch, and trixbox.
But I do visit the ser site now and then. It seems to be up for most times and there are some activities. I will watch and let you know if there are significant changes. For now choose Openser.
Just for your information, I will state the history of OPENSER here, straight from the site;

OpenSER project started on the 14th June, 2005. That looks as a pretty young project, but actually it is full of history.

Origin of OpenSER started back in 2001-2002, at FhG FOKUS research institute in Berlin, Germany. In autumn 2002, the SIP Express Router (SER) project developed to be used in different European IST projects (e.g., EVOLUTE) was released open source under GPL license and the source tree moved to BerliOS open source mediator site. The home web site of the project was http://www.iptel.org, hosted by FhG FOKUS. The core developers of SER SIP server were: Andrei Pelinescu-Onciul, Bogdan-Andrei Iancu , Daniel-Constantin Mierla , Jan Janak and Jiri Kuthan. Very soon, new contributors joined the project, among early contributors you can find Juha Heinanen , Maxim Sobolev, Elena-Ramona Modroiu, Adrian Georgescu .

The quality and flexibility of the project made it grow rapidly. It was used in other IST projects but it moved in business. Sites like FreeWorldDialup, SipPhone, SipGate, VoIPUser are well known reference points and early adopters of the project.

Unfortunately, at the end of 2004, the evolution of the public project took an undesired direction. FhG Fokus decided to start a spinoff, iptelorg.com Gmbh, that focuses on businesses with SER. Soon after, iptelorg.com Gmbh was sold to Tekelek, which had no intention to continue the development of the public project. The core development team split in two: three of them followed Iptelorg.com Gmbh (Andrei Pelinescu-Onciul, Jan Janak and Jiri Kuthan) and the other two continued with the research institute (Bogdan-Andrei Iancu , Daniel-Constantin Mierla ). After a while, Bogdan-Andrei Iancu and Daniel-Constantin Mierla left the institute and started the OpenSER project in June 2005.

The fork of the project was forced by the obstacles encountered in the collaboration with Iptelorg.com Gmbh. No contributions were accepted, releases were delayed, no interest in project’s development. The team founding OpenSER project was completed with Elena-Ramona Modroiu - a main contributor of SER (xlog, avpops, diameter support, pdt, speeddial).

Other SER contributors joined the project: Juha Heinanen , Klaus Darilion , Adrian Georgescu , Cesc Santasusana , Dimitry Isakbaiev, Andreas Granig. After one year, the project counted over 60 people contributing with code, patches or documentation.

First OpenSER release happened on the 14th June 2005, versioned 0.9.4 - source code forked from SER branch 0.9.0. Since then, other releases were made: 0.9.5 patch update to 0.9.4; 1.0.0 - major release - first open source SIP server with TLS support on the 28th October 2005; 1.0.1 - patch updated to 1.0.0; and last major release at this moment, 1.1.0, on the 10th July 2006.

Links to sites and articles;
VOIP IP Telephony: Asterisk Beta 1.4 by the end of the week and an interview!
OpenSER History
VOIP IP Telephony: Trunk trixboxes (two right now!)
VOIP IP Telephony: FreeSWITCH breaks new ground in VOIP, telephony world!

Source: snapvoip.blogspot.com

If you happened to be on the OPENSER site browse over to the history of openser, you will find that there is no real comparison.
I was a ardent fan of SER and have implemented a few servers using various versions of SER. But I was always wondering about the way the development was traveling, from company to company and IPTEL.ORG site was off line for days. As the OPERNSER article states, Basically I could not count on the project. I was worried about the state of servers I have deployed.
Then I found OPENSER project, installed a test server, verified connectivity that I was using. All were better than before and at that point I converted all my servers one by one to OPENSER. OPENSER behaves very well among the all the itty bitty servers that I have running, Asterisk (versions 1, 1.2 and the latest 1.4), FreeSwitch, and trixbox.
But I do visit the ser site now and then. It seems to be up for most times and there are some activities. I will watch and let you know if there are significant changes. For now choose Openser.
Just for your information, I will state the history of OPENSER here, straight from the site;

OpenSER project started on the 14th June, 2005. That looks as a pretty young project, but actually it is full of history.

Origin of OpenSER started back in 2001-2002, at FhG FOKUS research institute in Berlin, Germany. In autumn 2002, the SIP Express Router (SER) project developed to be used in different European IST projects (e.g., EVOLUTE) was released open source under GPL license and the source tree moved to BerliOS open source mediator site. The home web site of the project was http://www.iptel.org, hosted by FhG FOKUS. The core developers of SER SIP server were: Andrei Pelinescu-Onciul, Bogdan-Andrei Iancu , Daniel-Constantin Mierla , Jan Janak and Jiri Kuthan. Very soon, new contributors joined the project, among early contributors you can find Juha Heinanen , Maxim Sobolev, Elena-Ramona Modroiu, Adrian Georgescu .

The quality and flexibility of the project made it grow rapidly. It was used in other IST projects but it moved in business. Sites like FreeWorldDialup, SipPhone, SipGate, VoIPUser are well known reference points and early adopters of the project.

Unfortunately, at the end of 2004, the evolution of the public project took an undesired direction. FhG Fokus decided to start a spinoff, iptelorg.com Gmbh, that focuses on businesses with SER. Soon after, iptelorg.com Gmbh was sold to Tekelek, which had no intention to continue the development of the public project. The core development team split in two: three of them followed Iptelorg.com Gmbh (Andrei Pelinescu-Onciul, Jan Janak and Jiri Kuthan) and the other two continued with the research institute (Bogdan-Andrei Iancu , Daniel-Constantin Mierla ). After a while, Bogdan-Andrei Iancu and Daniel-Constantin Mierla left the institute and started the OpenSER project in June 2005.

The fork of the project was forced by the obstacles encountered in the collaboration with Iptelorg.com Gmbh. No contributions were accepted, releases were delayed, no interest in project’s development. The team founding OpenSER project was completed with Elena-Ramona Modroiu - a main contributor of SER (xlog, avpops, diameter support, pdt, speeddial).

Other SER contributors joined the project: Juha Heinanen , Klaus Darilion , Adrian Georgescu , Cesc Santasusana , Dimitry Isakbaiev, Andreas Granig. After one year, the project counted over 60 people contributing with code, patches or documentation.

First OpenSER release happened on the 14th June 2005, versioned 0.9.4 - source code forked from SER branch 0.9.0. Since then, other releases were made: 0.9.5 patch update to 0.9.4; 1.0.0 - major release - first open source SIP server with TLS support on the 28th October 2005; 1.0.1 - patch updated to 1.0.0; and last major release at this moment, 1.1.0, on the 10th July 2006.

Links to sites and articles;
VOIP IP Telephony: Asterisk Beta 1.4 by the end of the week and an interview!
OpenSER History
VOIP IP Telephony: Trunk trixboxes (two right now!)
VOIP IP Telephony: FreeSWITCH breaks new ground in VOIP, telephony world!