SAPLogix.net Official Blog

Text taken from: http://www.piemontewireless.net/PJSip155_and_iPhoneSDK312
Thanks to huge work of PJSip team and to Samuel Vinson for iphonesound.c code.
Checkout the latest svn trunk version of PJSip from here:
http://svn.pjsip.org/repos/pjproject/trunk
or download the latest PJSIP from here:
http://www.pjsip.org/download.htm
First step, you need to patches some files in pjproject:
Step 1: aconfigure.ac
In aconfigure.ac file add the lines below displayed with ‘+’. Of course [...]

The problem with pjsip 1.0.3 that it does not feature G7221 or G729, i managed to get the G722 codec working and its pretty straight once you understand whats going on… Here is the procedure:
once you have populated the config_site.h, enable the G722 codec, here what it should look like:
#undef PJ_HAS_FLOATING_POINT
#define PJ_HAS_FLOATING_POINT 1
/* [...]

Thanks to Samuel who made this possible for iphone, the text below is taken from the following site with few modification to compile it successfully for iphone.
link: http://code.google.com/p/siphon/wiki/CompilationForiPhoneOS2_X
Lets begin, download the 1.0.x release of pjproject from the pjsip website, i have given link below for ease.
link: http://www.pjsip.org/download.htm
(note: GNU Linux/MacOS X/Unix users should use the .tar.bz2 [...]