RESOLVED Re: [Asterisk-Users] Problems and questions with setting up a Feature Group D trunk to a Nortel DMS-10 switch

[John Fulton]

I was having problems with a Feature Group D trunk into a Nortel DMS-10 switch in our Nome office in Alaska.

After receiving the digit spill with the called number, and calling number (ANI) from the switch, Asterisk would wink the switch and then the switch would hang up on the trunk.

After a TON of debugging, many days on the phone with Digium, and watching a T-berd, we discovered a timing issue with Asterisk that was slightly out of spec.

After the LD provider (Asterisk) sends the acknowledgement wink for the digit spill, the LD provider is supposed to wait on-hook for 250ms before going off-hook. Asterisk was immediately transferring control of the call to extensions.conf after the wink which executed Answer() within 50ms causing it to go off-hook too soon.

To fix the problem, all I had to do was add a 300ms wait before executing Answer():

[default]

exten => _X.,1,Wait(.3)

exten => _X.,n,Answer()

...........

I hope this helps anyone else that may run into this problem.

John Fulton
TelAlaska Inc.
Anchorage, AK

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