Good day, i have encoutered a problem witn an invite parsing sent to sofia
lib.
Looks like it does not like the following syntax
a=rtpmap:8 PCMA/8000/1
The call is refused with the reason 400 bad description, a call is accepted
if the rtpmap does not have /1 at the end:
a=rtpmap:8 PCMA/8000
As per rfc
a=rtpmap:<payload type> <encoding name>/<clock rate> [/<encoding parameters>]
Looks like the encoding parameters produce an issue here, encoding
parameters are the "channels" you can seem them here:
https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml
The problem is reproduced on freeswitch and Janus webrtc gateway.
The logs i have are not so explicit, so i had to test different
scenarios to be sure:
soa_set_remote_sdp(static::0x7f54200192d0, (nil), 0x7f542002040a, 583) called
nua(0x7f54200102f0): INVITE server: error parsing SDP
nua: nua_invite_server_respond: entering
tport_tsend(0x7f54200038a0) tpn = UDP/176.222.111.200:5060
tport_resolve addrinfo = 176.222.111.200:5060
tport_by_addrinfo(0x7f54200038a0): not found by name UDP/176.222.111.200:5060
tport_vsend(0x7f54200038a0): 586 bytes of 586 to udp/176.222.111.200:5060
tport_vsend returned 586
nta: sent 400 Bad Session Description for INVITE (780)
Any ideas how to solve that ?
Gregoriy Dobrovolskyy
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