what is the rtp payload value for amr-nb codec?

Question

I found Rtp payload values for PCMU=0 and G729=18 etc.But I cant find value for AMR.I search in this link Rtp_parameters

Answer 1

There is no specific fixed value reserved for AMR, values for dynamic assignment range are to be used.

RFC 3551:

This profile reserves payload type numbers in the range 96-127 exclusively for dynamic assignment. Applications SHOULD first use values in this range for dynamic payload types.

Example from RFC 4867:

m=audio 49120 RTP/AVP 97 98 99
a=rtpmap:97 AMR/8000/1
a=fmtp:97 mode-set=0,2,5,7; mode-change-period=2; \
  mode-change-capability=2; mode-change-neighbor=1
a=rtpmap:98 AMR/8000/1
a=fmtp:98 mode-set=0,2,3,6; mode-change-period=2; \
  mode-change-capability=2; mode-change-neighbor=1
a=rtpmap:99 AMR/8000/1
a=fmtp:99 mode-set=0,2,3,4; mode-change-period=2; \
  mode-change-capability=2; mode-change-neighbor=1
a=maxptime:20