[asterisk-dev] 13.24.1 / PJSIP: early media via 180 Ringing containing SDP is ignored

[Michael Maier]

Hello!

Given is an outbound call to a callee via asterisk to the ISP. After INVITE, the ISP sends 100 Trying and some time later 180 Ringing *w/* SDP and the header
"P-Early-Media: sendonly" (no 183 or any other thing until callee responds). SDP in 180 contains media attribute *sendrecv* (contradicting to the P-Early-Media header).

Asterisk 13.24.1 sends PRACK to the ISP (w/o SDP) and the 180 to the caller - but SDP is dropped and therefor no early media is possible!

Is this behavior a bug or a feature?



Thanks,
Michael