* What is the default encoded frame size of gsm codec?
* What is the default decoded frame size?
* What are the media attreibutes?
* What is the codec id?

For example same questions for G729's answers are 20, 160, "fmtp:18 annexb=no" and 18 respectively. I am working on a softphone and I want to add the gsm codec to it.

Any help?