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Originally Posted by ruudsplint
How about SIP?
We use CM2.2 and CCS2.1 to communicatie with SIP.
Modems do connect, even at 33.6K but performance is poor.
Fax is oke, don't use T.38 because it won't talk with the providers Cisco gateway :D
We use G711 codec and ip-codec-set modem is off else it won't work.
I gues it is the UDP protocol used by the RTP stream causing the poor modem performance.
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We haven't started using SIP yet, but I would assume the problem would have been similar. I think the issue was old hardware (MedPRO's). As for the modem being off. Our's was set to off and it wasn't until I set it to pass through that I could get it to work. Since our business is tourism, we aren't going to put this solution into full production until after the New Year. Previously when our vendor mentioned that it wouldn't be supported, we had designed a work around bringing in PSTN analog lines.