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SIP Trunk FAX T.38 /G711 two m-line

ROLAND MARTI
Level 4
Level 4

Hi All

mybe there is an old problem. We have to replace our ISDN FAX connection with SIP Trunk.

Design:

FAX Server(Kofax) - CUBE(CS-4451 IOS XE Software, Version 16.03.05) - TelkoProvider(Sunrise)

Prefered Codec for FAX : G711 aLaw

Now we have a problem that after the first connect with G711 aLaw the Provider send us an REINVITE with two m-lines. First T38 / second G711.

The CUBE dosn't handle this correct and send an 488 Not Acceptable Media CSCue70469

 

My question is it possible to change the order of the m-lines with sip-profiles.

m=image 21228 udptl t38
a=T38FaxVersion:0
a=T38MaxBitRate:9600
a=T38FaxRateManagement:transferredTCF
a=T38FaxMaxBuffer:200
a=T38FaxUdpEC:t38UDPRedundancy
m=audio 21230 RTP/AVP 8 0 121
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:121 CLEARMODE/8000
a=ptime:20
a=fax

 

Thank you 

Roland

 

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