Trunk to trunk calls do not disconnect 1

[ValiantSoft1]

I have an Avaya Ip Office 8.1 (67) with 2 DS8 modules (Slot1,2) and 2 Combo cards (slot 3,4) using all 8 analog lines. I have setup trunk to trunk transfer -forward unconditional- to forward calls to cell phones. The feature works good with no problems - client calls in, AA picks up (AA picks up all incoming calls), client dials the user's ext and if the IPO user has forward unconditional enabled, the call is forwarded properly but never disconnects, even when both parties end the call.
Here what I have tried from this forum:
- Calls disconnect ok when dialing out of a phone or when calling into the IPO
- Changed the disconnect clear setting from 500ms to: 50, 100, 150, 200, 220, 600, 650, 700, 800ms.
- Changed the ARS from Dial3K1 to just Dial.
- Enabled Busy Tone Detection with all the 3 available options: System Frequency, Single and Dual Frequency. Also tried with all three Disconnect tone options: On, Off and default
- Called the telco and was told disconnect clear = 800ms
On all tests I used System Status and waited at least 2 minutes before manually disconnecting the call. If I don't disconnect the call I get "if you like to make a call, hung up and try again..." followed by a continuous tone. All other incoming/outgoing calls disconnect around 20s after end of call

Thank you in advance.

 

[TouchToneTommy]

Have you confirmed that you are actually receiving the disconnect signal from the phone company? Have you tested on a butt set ahead of the system? Can you see the disconnect signal on an analog voltmeter? Do you know what type of equipment is in the central office serving your lines?

I would guess that the phone company is not actually delivering the disconnect open loop, or the lines are going through pair-gain equipment that won't pass it, or the central office equipment is not compatible with the feature.

 

[ValiantSoft1]

TouchToneTommy: I'll get answers in the next couple of days. Call disconnect works fine on all other calls except trunk to trunk. If there was a problem with the CO all calls would be affected. Also the system has Embeded voice mail/Essential edition.

 

[IPGuru]

ValiantSoft1
TTT is almost certainly correct about the disconnect clear
the reason why everything apart form t-t calls are ok is because the IPO disconnects the line when the user hangs up, disconnect clear is not required from the CO in these circumstances.

if Disconnect clear is being sent by your provider then you need to check the timings.

a more sensible option would be to switch to ISDN, T-T transfers on analog lines are generally not a good idea for precisely this type of issue.

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Do things on the cheap & it will cost you dear

 

[ValiantSoft1]

After several calls to telco, disconnect clear was added to the lines and problem solved. Thanks