Heplify does not capture RTCP packets when rtcp-mux is in use

[hamptonng]

We have two FreeSWITCH instances with a call between them (a load testing scenario), and they default to using rtcp-mux (RFC 5761).

In this case, heplify does not pass the RTCP packets for that call to the heplify server so no QoS information is recorded.

[lmangani]

Thanks for the report @hamptonng
Please attach some examples or PCAP for the missed packets if you'd like this to be looked into

[hamptonng]

ldtcall.zip

Thanks for the fast response - pcap attached.

[hamptonng]

I believe a simple fix is to remove the odd port number check in decoder.go prior to correlateRTCP. Under rtcp-mux RTCP is likely to be on an even port number.

[kYroL01]

@hamptonng Can you please attach your test pcap ? Unfortunately I don't see it here.
In this case we will recheck your PR and test with the pcap, so we can merge or adjust.
Thank you!

[hamptonng]

The pcap is in the zip file attached to the comment above on 7th April (ldtcall.zip)