We are using Audiocodes Mediant for Softphone remote users / remote Workplace users.
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We have never neen able to get the J1xx series to work with the CCMS sip massages.
I dont remember exactly but I believe it was somewhat like this:
(Digging far in my memory here...)
1) A sipphone user usually registers by just sending a register message. But the J10xx series registers the phone extension itself by using a register message. Now the user still has to register, I believe when a user logs in on a phone the jserie send an subscribe/notify ... or something similar to the IPO to do the registration. I think after some troubleshooting we got this to work. So a login , logout is done by a sip message that contains some kind of code.
2) Starting calls with a Jseries does not follow standard SIP protocol but it using a Avaya sip protocol using CCMS or something. The Audiocodes sbc has issues with the way the IPO and Jseries handle the calls. When a user on a deskphone starts a call, it does not send an invite to the IPO but it sends a notify (or something else, i forgot what it is) to the ipo that contains the number that needs to be dialed. The IPO on its turn then sends an invite to the deskphone that wants to start the call. We got basic calls to work through a Audiocodes Mediant but we had issues with transfers, confcalls, parking or holding calls.
I dont remember exactly if this is 100% , just know that this particular use of the SIP protocol is not really compatible with Mediant.
I talked to Audiocodes about this a few years back and there was not much they could do.
I also talked to Avaya, apparently to get the Jseries to work on the ASBCe they had to basically reinvent the way the ASBCe handles the calls..