atcomsystems.ca/forum Forums TDM Business Telephone Systems Avaya - Lucent Telephones & Systems Merlin Legend R7 w/Merlin Messaging R4

When a call is answered by VM and hangs up during the greeting the call won’t release and will ring the operator until answered. Is a disconnect function missing?

Far-End Disconnect (or Forward Disconnect) is not being sent by the carrier. You can strap the LS Disc parameter to "Unreliable", but it won't do much good when fronted by an Automated Attendant. The carrier simply MUST provide this signalling...end of story.

Any chance that these lines come out of a mux? Perhaps you just heated up some "flex" service from a CLEC, who often seem to overlook the FE Disc parameter.

This problem is very common when you have loopstart trunks riding a T1 circuit. The calling party disconnects, the voicemail does not see it and the call rings the 0 action timeout extension.

The best work around for the above scenario would be to change the signaling from loopstart to T1E&M wink.

Dexman, how do you know he is having T1? I didn't find any info on that. Seems to me everybody forgot Legend's LS-Disconnect option for Lines & Trunks.

Nostets didn't say that they have a T1.

My mention of the mixing of loopstart signaling and a dedicated T1 circuit came from years & years of working trouble tickets for ghost/phantom calls ringing through to receptionist consoles.

All of problems were caused by the loopstart trunks on the dedicated T1 circuit. Once we had vendors switch to either groundstart or T1E&M, the problems disappeared.

The only time I've seen the combination of loopstart and dedicated T1 work well is when the customer sends us calls only (no terminating calls to the customer).

I don't know any good tech. who would suggest his client to have T1 w/Loop Start emulation. That the same like cutting branch which you are sitting on.

Such an arrangement can work, but the applications are very limited.

Take for instance a call center. You could have 24 people sitting in cubicles. Each person has a single line telephone (Say an AT&T 925) connected to some sort of channelbank (Newbridge 3624 for example).

If those people are only responsible for calling out to potential customers, but not taking incoming calls, then the loopstart/T1 arrangement would be fine.

I know this scenario is a bit of a stretch, but it would work.

Broadcast faxing might be another application.