As the pcapplay doesn't care what codec is the payload of the packets it 
replays, I assume the issue is different.

Just a bunch of points I would look at:

- does the same happen with another codec, like PCMA?

- the G.722 packets in the pcap file you replay bear some payload type 
number. If the receiving side has assigned another payload type number 
to that codec in its SDP, I'm not sure whether SIPp respects that and 
modifies anything in the contents of the RTP portion of the replayed 
packets prior to sending them.

- there may be some misunderstanding regarding G.722, G.722.1 and 
G.722.2 - they are different (mutually incompatible) codecs and for the 
latter two, no fixed payload type number has been registered.

- if you replay exactly the same pcap file for all conference 
participants, the conference bridge may get confused by receiving 
several streams from different source sockets with the same SSRC, as 
SIPp does not modify SSRC while replaying a pcap.

Use tcpdump or Wireshark/tshark to check whether and where does SIPp 
actually send the RTP and what the payload type number is.

Pavel


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