[SIPForum-discussion] AMR RTP payload size for Bandwidth Efficient mode

Sun Jan 13 05:34:05 UTC 2008

Hi,

My requirement is to transmit RTP packets (single frame) using AMR-NB (Bandwidth Efficient) and I think as follows.  
  The AMR mode 7 (12.2kbps) has 244 speech bits. Adding 4 padding bits, this round up to 31 bytes.  So there should  only be 33 bytes in the RTP payload (Payload header: CMR (4 bits)+ Payload ToC: ToC entry (Follow on Frame (1 bit), Frame type (4 bits), Frame Quality indicator (1 bit)+31 bytes codec bits + 6 padding bits.  

Please confirm whether it conforms to the AMR RTP payload format (RFC3267) or not. 

Regards, 

Chinmaya.

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