pjsip stack : opus codec

i am using pjsip stack to make a voip app. I have been trying to integrate opus codec , but with no success. I have made the required .a file , included it into the project but inside the project, I can't even set the priority of the codec.

I used the siphon ios app which can be downloaded (pulled) from : https://github.com/radif/SIPHON-SIP-Client-that-actually-compiles.git

Then I replaced the pjsip libraries with new libraries that I created by incorporating opus codec into pjsip.

I did this in following way :

I checked out the pjsip source code from : http://svn.pjsip.org/repos/pjproject/trunk

Then I downloaded the opus branch v1.0.x under third_party/opus. http://www.opus-codec.org/downloads/

Finally I go to root directory of pjsip and apply the following patch file( using the command : patch -p1 <pjsip-opus.patch) :

https://docs.google.com/file/d/0B3xRt20RSegLWm9QdmlUZDh2ckE/edit?usp=sharing

Then i just included libopuscodec.a which is formed into my project.

But I can't use the opus codec for calling etc.

Could someone please tell me what to do ?