[asterisk-users] ZAP inbound/outbound connection taking too long

[Gavin Henry]

On 01/06/07, Gordon Henderson <gordon+asterisk at drogon.net> wrote:
> On Fri, 1 Jun 2007, Gavin Henry wrote:
>
> > Dear all,
> >
> > I think this is common, or at least how it is supposed to be, but
> > whening dialing over a ZAP channel, it's taking around 5~ seconds to
> > ring on the over end, likewise inbound.
> >
> > This is just with a normal Dial command.
>
> It's "normal" for an analogue Zap channel.
>
> Asterisk has to "sieze" the line (after a basic check to make sure the
> channel is free), that may entail a delay of a second or so while it makes
> sure there there is a dial-tone (actually, I'm not sure it waits for a
> dial-tone), then it sends the digits out via DTMF - that might take a
> second or 2 for a long number - then it's up to the PSTN switch at the
> other end to connect the call - depending on the technology, this might
> take several seconds.
>
> What you can do is connect to asterisk (asterisk -r), set verbose 9999,
> then initiate a dial and you'll see the dialplan progress and you can work
> out yourself where the longest part of the delay is...
>
> Inbound ought to be answered as soon as asterisk "hears" the ringing
> signal - but this might be one whole ring time from the ring starting,
> depending on how caller-id is being handled in your country, again,
> monitor it by looking at the output on the console, and by connecting an
> existing analogue phone in paralel with the incoming Zap line.
>
> Gordon
> _______________________________________________


Thanks for this explaination!

Gavin.

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