Source: snapvoip.blogspot.com

Bob Keyes have compiled all the Kamikaze 7.09 packages for mipsel (wgt634u, Netgear) have them available for download. (Other packages available as well, check the site.). In addition to the default ones, these are the other packages you get by performing "make package/symlinks).
sshfs, which fails compilation, and firmwarehotplug, which requires the sdcc compiler are not available from this source..

He also mentions that, "No warrantee, not even warrantee of merchantability, not endorsed or anything else by myself or Harvard University." and I agree with him and remind you that playing with your routers might lead to brouter, or a bricked router, I am speaking from experience.

http://sigil.eecs.harvard.edu/OpenWRT

This site should provide some pretty good download speeds, especially if you’re at a university on Internet2. Here is a list of Asterisk Specific files. All are IPK files.
asterisk-chan-bluetooth_1.2.24-1_mipsel
asterisk-chan-h323_1.2.24-1_mipsel
asterisk-chan-mgcp_1.2.24-1_mipsel
asterisk-chan-oss_1.2.24-1_mipsel
asterisk-chan-skinny_1.2.24-1_mipsel
asterisk-codec-lpc10_1.2.24-1_mipsel
asterisk-codec-speex_1.2.24-1_mipsel
asterisk-mini_1.2.24-1_mipsel
asterisk-mysql_1.2.24-1_mipsel
asterisk-pbx-dundi_1.2.24-1_mipsel
asterisk-pgsql_1.2.24-1_mipsel
asterisk-prompt-de_2.0-1_mipsel
asterisk-res-agi_1.2.24-1_mipsel
asterisk-res-crypto_1.2.24-1_mipsel
asterisk-sounds_1.2.24-1_mipsel
asterisk-sqlite_1.2.24-1_mipsel
asterisk-voicemail_1.2.24-1_mipsel
asterisk14-chan-alsa_1.4.11-1_mipsel
asterisk14-chan-gtalk_1.4.11-1_mipsel
asterisk14-chan-h323_1.4.11-1_mipsel
asterisk14-chan-mgcp_1.4.11-1_mipsel
asterisk14-chan-mobile_1.4.2-1_mipsel
asterisk14-chan-ooh323_1.4.2-1_mipsel
asterisk14-chan-skinny_1.4.11-1_mipsel
asterisk14-codec-ilbc_1.4.11-1_mipsel
asterisk14-codec-lpc10_1.4.11-1_mipsel
asterisk14-codec-speex_1.4.11-1_mipsel
asterisk14-format-mp3_1.4.2-1_mipsel
asterisk14-mini_1.4.11-1_mipsel
asterisk14-mysql_1.4.2-1_mipsel
asterisk14-pbx-dundi_1.4.11-1_mipsel
asterisk14-pgsql_1.4.11-1_mipsel
asterisk14-res-agi_1.4.11-1_mipsel
asterisk14-res-crypto_1.4.11-1_mipsel
asterisk14-sounds_1.4.11-1_mipsel
asterisk14-sqlite_1.4.11-1_mipsel
asterisk14-voicemail_1.4.11-1_mipsel
asterisk14_1.4.11-1_mipsel
asterisk_1.2.24-1_mipsel

OpenWrt Forum Post might give more information

Source: snapvoip.blogspot.com

As you know Asterisk have been loaded on everything from servers to workstations, routers and virtual machines. But you may know that it is possible to run the Asterisk server from a wireless router too. My favorite wireless router is WRT54G and I have been using OpenWRT so much that I had to get multiple WRT54G routers so that I had a working wireless router for the rest of the household that use notebooks.
So while browsing around OpenWRT forums, I noticed that User Sskol has written how to get Asterisk 1.4 on white Russian RC6 (White Russian is a one version of OpenWRT) and I got to work following his instructions, only to find user Zandbelt has done all the work. He/She also have package for the Asterisk GUI.
So now I am playing with his version. If you are so inclined please follow the links and make your wireless router speak Asterisk. But be warned, these may damage your router and render it non functional.

Links;
OpenWRT Developer Forum discussion
Zandbelt’s work
OpenWRT site