BCM 450 phantom ringing on disconnected calls

[pmcook]

What hapopens is that when a call comes in and is answered then the call is hung up, 7 times or so out of 10 what is happening is that the line rings again. If you pick up it is dead air. They are running 3.6. These are all Verizon analog copper trunks.

 

[phoneguy610]

Check the delayed ring transfer

ddcommllc.com
Avaya/Toshiba/Nortel

ACIS

 

[pmcook]

What am I looking for?

 

[cook1082]

It is the voltage on the line, what is happening is if you answer when it is ringing when the voltage is present you can answer it but inbetween the rings the voltage drops and you cant and it keeps ringing. This is a telco problem, have the line voltage checked.

 

[phoneguy610]

cook i have also seen this as a delayed ring transfer issue

try bumping this to 10 rings see if it fixes the issue

ddcommllc.com
Avaya/Toshiba/Nortel

ACIS

 

[cook1082]

Easy way to test is see if you can answer the call while it is ringing. Plus this may not be happening on all the lines. They will need to test each line.

 

[pmcook]

Some clarification - the calls can nall be answered with no problems. They canb have a normal convo. What hapopens is when they hang up, the line rings back. Both parties have hung up but the line rings back. Only the BCM side seems to ring not the caller side. It is only on incoming calls.

 

[cook1082]

Just saw when haung it rings back. Do they have VM on the lines? I could be notification of a VM.

 

[pmcook]

Yes they do have VM. But there is no voice mail left/

 

[snowman50]

I think he means Do the Lines have External voicemail at the Telco side before the BCM.
Then maybe the LINE is doing a ring back to notify you of a voicemail.

 

[pmcook]

No external VM. I guess I was not clear. A call comes in. A person picks up the call. They talk. They say goodbye. They hang up. The phone rings back and there is dead air. The display does not show the source or CID. Happens more than half the time.

 

[snowman50]

Is it Patched up to the Latest SU Patch.this will also do a reboot

Make sure you patch up the system for ther is quite alot of BUG fixes.

 

[telcodog]

No such thing as a BCM450 running 3.6 software. Are you sure it's not an old 400, or a 450 running Linux?

 

[pmcook]

I was wrong - 400 running Windows NT.

 

[telcodog]

Check with your Telco to see if if there are any features from them active on the lines. I've seen this happen before when the customer wants call forwarding, conferencing ets and instead of talking to the PBX vendor they talk to the phone company. The ability to do a switchook flash on the line causes no end of trouble of phone switches.