Offlist, someone mentioned to me that it might be appropriate for XEP-0167 to recommend or even require support for the ITU-T's G.711 technology, which is represented by payload-types 0 (PCMU) and 8 (PCMA) as registered with the IANA.
Section 4.5.14 of RFC 3551 describes G.711 as follows: PCMA and PCMU are specified in ITU-T Recommendation G.711. Audio data is encoded as eight bits per sample, after logarithmic scaling. PCMU denotes mu-law scaling, PCMA A-law scaling. A detailed description is given by Jayant and Noll [15]. Each G.711 octet SHALL be octet-aligned in an RTP packet. The sign bit of each G.711 octet SHALL correspond to the most significant bit of the octet in the RTP packet (i.e., assuming the G.711 samples are handled as octets on the host machine, the sign bit SHALL be the most significant bit of the octet as defined by the host machine format). The 56 kb/s and 48 kb/s modes of G.711 are not applicable to RTP, since PCMA and PCMU MUST always be transmitted as 8-bit samples. More information about G.711 is available here: http://en.wikipedia.org/wiki/G.711 http://www.voip-info.org/wiki-ITU+G.711 http://www.itu.int/rec/T-REC-G.711/e Thoughts? Peter -- Peter Saint-Andre https://stpeter.im/
smime.p7s
Description: S/MIME Cryptographic Signature
