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

[Stephen Bosch]

Hi, Lee:

Lee Jenkins wrote:
> Lee Jenkins wrote:
>>
>>
>> Hi everyone,
>>
>> I just installed a TDM02B and surprisingly, I had really no problems
>> except one.
>>
>> If I place an outbound call on the Zap line (Zap/3), everything works
>> fine except when the called party hangups before I do.  I do get
>> congestion, but that is expected.  However, when I try to make another
>> outbound call using that Zap line, the CLI shows that the call is
>> being dialed, but nothing happens and I get the telco's message "if
>> you'd like to make a call, hang up..." after a few seconds.
>>
>> If I call out to a party on that Zap line and hangup first, I do not
>> experience that problem.  It looks like Asterisk is not getting the
>> termination signal from the telco (Verizon) when the other party hangs
>> up first.
>>
> 
> After playing around a bit, it appears that this is just random as far
> as I can see.  It may allow me to dial a few times, but then hangup.
> After rebooting my server, it may let me dial once and then start
> hanging up.
> 
> I really hope it's not a fight with every TDM that I will have to
> install.  After reading so many problems posted on the list, I thought I
> had got off easy, lol.

This problem is very common. I am in Alberta and a Telus customer. I
have a very similar issue:

When the remote party hangs up, the TDM card does not detect the
disconnect. Sometimes it sits on the line for more than 30 seconds,
making it impossible to make incoming or outgoing calls on the channel.

This is the configuration in zapata.conf:

; define channels
context=incoming
signalling=fxs_ks
channel => 4

I use kewlstart signalling, which is supposed to cover most every
situation, right?

I've called the telco to discuss this issue, but nobody has a clue -- be
it about call disconnect signalling, analog to PBX connections or
anything else for that matter. This morning I spent more than 30 minutes
on the phone and got transferred through to four departments, all of
whom assured me that the *next* department would be able to answer my
question.

One person I spoke with insisted that most everyone with a PBX is using
digital lines, but I know firsthand that lots of people still use analog
lines with their PBXs. They must be doing something to clear the lines
after the other caller hangs up.

Any ideas?

-Stephen-


PS: For what it's worth, Verizon owns 33 percent of Telus; the network
equipment in BC is pretty much the same as what is in use in what used
to be GTE's regions.