[asterisk-users] Installed TDM02B - Problem when other end hangs up

[Stephen Bosch]

Lee Jenkins wrote:
> I forgot to mention that the one thing that seems to be consistent is
> that I can get the zap line to reset and dialout again correctly by
> calling into the system on that zap line, dialing and extension and
> allowing the extension to hangup on the caller first.
> 
> Then it will dial out again.  Odd.

Cisco has quite a bit of material on this subject (why should they
special? I'll bet their telephony stuff is plagued by this problem too).

This document describes different kinds of supervisory disconnect
signalling:

"Understanding FXO Disconnect Problem"

http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00800ae2d1.shtml

This one provides a good summary of signalling:

http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00800a6210.shtml#Topic3A

I think the problem comes down to knowing what kind of signalling the
telco is using (if it is using any at all) and then configuring the TDM
accordingly.

I wonder if anyone has had any luck getting that kind of information
from any ILEC.

-Stephen-