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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