End of message timeout

[thames]

Hi Folks

Just installed a Patton Smartnode connected to Virgin Media standard analog telephone lines. All working 100% except for one annoying little item. When someone leaves voicemail and then puts the phone down, the system seems to wait for about 20 or 30 seconds before actually releasing the line and telling 3CX that a hang-up has occurred. This is not critical but would result in smaller Emails to recipients. So... from the end of the voice message to the end of the call we get a long engaged tone, for around 20 or 30 seconds. Is there a way to stop this from happening?

Cheers
Chris

 

[leejor]

It can depend on a few factors...When using a Gateway connected to an analogue line, and the calling or called party hangs up first, there are generally 3 methods of detecting that.

Silence detection, usually after a given duration the call will be forced to drop by the gateway if there is no audio.

Disconnect tone, the PSTN will send a particular tone (varies buy location and provider) to tell the customer that they have left a handset off-hook. This tone can be used by the Gateway to drop the line. Requires the tone parameters to be set up correctly in the gateway.

CPC, Calling (or Called) Party Control...This can be either a short voltage disconnect, or, a current reversal when the PSTN end hangs up.
Using this requires that the PSTN provider provides this option, not all providers or, in your case, an ATA, do.

In your case, a disconnect is being detected, but not fast enough for you, you may have to live with that. If your gateway is using silence detection or disconnect tone, then there probably will be a delay in both cases. CPC is the only method that ensures a quick disconnect.

I'm not sure, but 3CX may be dropping after a certain length of silence on the voicemail.

 

[thames]

Hi Leejor.

Thanks for the feedback. I'll go back to VirginMedia and see if they offer the CPC facility.

Cheers
Chris

 

[SY]

I'm not sure, but 3CX may be dropping after a certain length of silence on the voicemail.

It will not work because of following information

So... from the end of the voice message to the end of the call we get a long engaged tone, for around 20 or 30 seconds

There is the sound which is delivered to PBX while device is trying to find the "disconnection tone"...

 

[thames]

Hi Stefan

Thanks for the reply. Does this mean we'll always have this issue, unless the line provider can provide the CPC?

Cheers
Chris

 

[leejor]

You may very well have to put up with it.
Silence detection time-out is usually set high enough (length) that calls don't drop during a lull in the conversation , low level speech, or. perhaps a call being placed on hold. A disconnect tone can take up to 30 seconds or longer to be applied to the line depending on your provider/ATA.

CPC, if available, is pretty much immediate.