[asterisk-users] Asterisk 16.16.1 crash upon receiving image 0 udptl t38 sdp

[Benoit Panizzon]

Hi List

I can reproduce Asterisk 16.16.1 segfaulting in this situation:

Asterisk configured with Application "ReceiveFax".

Incoming call with SDP:

v=0
o=prt-cbl-sbc1 1418830458 1418830459 IN IP4 157.161.X.X
s=sip call
c=IN IP4 157.161.X.X
t=0 0
m=audio 11828 RTP/AVP 9 8 101
a=rtpmap:9 g722/8000
a=rtpmap:8 pcma/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
a=ptime:20

Asterisk Answering to Invite with 200 OK + SDP

v=0
o=prt-cbl-sbc1 1418830458 1418830461 IN IP4 157.161.X.X
s=sip call
c=IN IP4 157.161.X.X
t=0 0
m=audio 11830 RTP/AVP 8 101
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=maxptime:150
a=sendrecv

ReceiveFax invoking Re-Invite to t38:

v=0
o=prt-cbl-sbc1 1418830458 1418830462 IN IP4 157.161.X.X
s=sip call
c=IN IP4 157.161.X.X
t=0 0
m=image 11830 udptl t38
a=sendrecv
a=T38FaxVersion:0
a=T38MaxBitRate:14400
a=T38FaxRateManagement:transferredTCF
a=T38FaxMaxDatagram:425

Caller telling. I am unable to do t38 by setting image port to zero in
200 OK + SDP reply to T38 Invite:

v=0
o=prt-cbl-sbc1 1418830458 1418830460 IN IP4 157.161.10.229
s=sip call
c=IN IP4 157.161.10.254
t=0 0
m=image 0 udptl t38
a=sendrecv

I have found a Snom M9 and a Grandstream Phone behaving that way.

Upon receiving that 200 OK + SDP Asterisk is segfaulting!

Has anyone else observed said issue?

Mit freundlichen Grüssen

-Benoît Panizzon-
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