Hello!

Decrypting SRTP with Kamailio + rtpengine.

Hello! I have a task to decrypt SRTP for a legacy switch which doesn’t support it.

Simply adding rtpengine_manage("RTP/AVP") didn’t help. SDP converted from SRTP to RTP while proxying INVITE to legacy switch, but 180 Ringing wasn’t converted back to SRTP.

Little more detailed config snippet:

route[RELAY] {

...

if (is_method("INVITE")) {

if ($rd=~$var(switch_ip_mask)) {

rtpengine_manage("RTP/AVP");

} else {

rtpengine_manage();

}

...

}

Could someone please advise typical scenarios to achieve it, I suppose the task is pretty standard.

Thank you in advance!