mybe there is an old problem. We have to replace our ISDN FAX connection with SIP Trunk.
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
m=audio 21230 RTP/AVP 8 0 121
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
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."