I’ve recently set up a trunk between an Asterisk 13.9.1 and an older Asterisk 11.5.1. It appears that some calls have about 5 seconds missing during the call (mostly queues).
It looks like RTCP packets are sent with a 5s interval according to the default “rtcpinterval” parameter in rtp.conf. However, sometimes when a RTCP-packet coming from asterisk 11.5 is received by the asterisk 13.9, the 13.9 server stops transmitting RTP-packets for about 5 seconds. Afterwards, a new incoming RTCP-packet triggers the RTP to be sent again.
Is this somehow the rtcpinterval parameter colliding? The problem is simular to this older thread: