[Asterisk-Users] Plain Old Answering Machine

[Rich Adamson]

> I have an fairly vanilla answering machine (actually its a combo
> cordless phone/answering machine) attached to an FXS port (on a TDM400
> Card).
> 
> Everything is working as planned except I seem to be having a bit of
> trouble with the answering machine.  After is answers it plays the
> outgoing message and then hangs up before letting the caller leave a
> message. (it actually hangs up before the outgoing message is
> completely played)
> 
> I think this is a problem with the answering machine (not asterisk),
> but I'm limited to what I can change on the Answering Machine.
> 
> I've tried the obvious.  My dial statement does not contain a timeout...
> exten => s,3,Dial,Zap/1
> 
> and I did check to make certain the machine is not in greeting only mode
> 
> There is not much too change on the answering machine other than no of rings.
> I did try another another answering machine and I did not have this
> problem (that's why I think its the machine not asterisk).
> 
> I think the machine is trying to detect if someone is on the remote
> side of the call.  If not it hangs up.
> 
> Anything I can do with asterisk to help correct this situation?

Pure guess.... the answering machine may be opening tip/ring and 
asterisk interprets that as a disconnect.

Try putting a plain old voltmeter across tip/ring and see what happens 
when the disconnect occurs.

Another guess is the answering machine is spewing a tone between the 
message and recording, and asterisk hears the tone and disconnects.