[OpenSIPS-Users] MediaProxyRelay - Media types do not match Error

[Dan-Cristian Bogos]

Hey Guys,

something I have noticed while dealing with T.38.

I have a provider who re-invites with the following sdp:

"""
.
v=0.
o=SIP_5F9 123456 654322 IN IP4 CONN_IP_PROVIDER.
s=-.
c=IN IP4 CONN_IP_PROVIDER.
t=0 0.
m=audio 0 RTP/AVP 0.
m=image 26858 udptl t38.
a=T38FaxMaxBuffer:288.
a=T38FaxRateManagement:transferredTCF.
a=T38FaxUdpEC:t38UDPRedundancy.
"""

The answer coming from re-invited device (which happens to be an
asterisk right now):

"""
.
v=0.
o=root 3484 3485 IN IP4 CONN_IP_ENDPOINT.
s=session.
c=IN IP4 CONN_IP_ENDPOINT.
t=0 0.
m=image 4653 udptl t38.
a=T38FaxVersion:0.
a=T38MaxBitRate:9600.
a=T38FaxRateManagement:transferredTCF.
a=T38FaxMaxBuffer:200.
a=T38FaxMaxDatagram:200.
a=T38FaxUdpEC:t38UDPRedundancy.
"""

The answer coming from the endpoint will produce an exception in
mediaproxy, therefore sending wrong conn_ip. I assume mediaproxy
considers the "on hold" audio as update to the existing media type
"m=audio 0 RTP/AVP 0.", instead of updating the session media type to
the new "m=image 26858 udptl t38.". Is this what you guys expect to do?

[RelayClientProtocol,client]     exceptions.ValueError: Media types do
not match: "audio" and "image"

Thanks in advance for any kind of advice.

DanB