Hi Mokhtar,there is a bunch of minor issues in your scenario (like use of static media port in the SDP instead of |[auto_media_port]|, declaring RTP payload 107 on the |m=audio| line but using 125 at the |a=rtpmap| line which will confuse the recipient of that SDP), but the actual reason why SIPp does not replay your audio.pcap is that the frames in it contain 802.1Q (VLAN) headers. So use tcprewrite and tcpprep (on linux, I know no equivalent for Windows) to remove the VLAN headers and try again. Or it may be easier for you to capture another opus payload, specifying the VLAN interface rather than the whole Ethernet, this will provide a VLAN-header-less capture too.
Or, if you want, I may send you the modified file back :-) P.
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