[asterisk-dev] FXO with Call Forwarding

[Rich Adamson]

> We are using Asterisk 1.2 and have a TDM 400P installed with 2 FXO ports 
> – each of these is plugged into a separate PSTN line with its own phone 
> number. We have everything configured pretty well, but one strange issue 
> is occurring which I’m hoping you can shed some light on. We use call 
> forwarding from the PSTN provider (Verizon) when we are going to be 
> away. In order to turn on call forwarding, we grab an outside line and 
> dial *72 and then the # we want to forward to. To disable call 
> forwarding we dial *73. After we have forwarded our calls through 
> Verizon, when a call rings at the forwarded line, we get a single ring 
> in Asterisk before the call is forwarded. This behavior is expected as 
> it happened with the old phone system. However, Asterisk doesn’t seem to 
> drop that channel after that call rings in and it will remain in the 
> “Off Hook” state until pulling out the phone line and plugging it back 
> in to Asterisk. Is there a reason for this?

Asterisk (and the associated TDM400 drivers) will not answer that 
ringing line unless you have something in your config that tells it to 
answer. That could range from having an "answer" statement in your 
dialplan to an improperly configured ivr, and possibly incorrect 
zapata.conf parameters.

Without knowing what those sections of zapata.conf and extensions.conf 
look like, its anybodies guess what might be wrong.