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
I found this tech note but the sip-profile never seems to get invoked. Not sure what I'm doing wrong...
Try this configuration:
voice service voip
sip
pass-thru content sdp
In this way the SDP is not negotiated by CUBE but passed directly to your fax:
"Passes the SDP transparently from in-leg to the out-leg with no media negotiation."