While writing an application to page to Polycom phones using PTT/Group paging, I discovered a couple of discrepancies in the "Engineering Advisory 70568 Polycom® UC Software PTT/Group Paging Audio Packet Format" document found here.
Firstly, tables 7 and 8 are incorrect. Both tables show 14 bytes highlighted for the Caller ID string, but the Caller ID string is 13 bytes. The 14th byte (0x09) is actually the codec being used in the page (g.722). The next byte (0x00) is labeled as the codec (g.711 uLaw), but it's actually "Flags." The next byte (0x6f) is labeled as "Flags" but it's actually the first byte of the sequence number. The last byte labeled as the sequence number (0x5e) is actually the first byte of the RTP payload.
Secondly, table 12 does not show the sequence number incrementing. The sequence number should be incremented by the number of samples sent in the previous packet.
I just wanted to bring this to someone's attention.
I have raised this internally. Thank you for bringing this to our attention.
Polycom Global Services
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