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

[Drew Gibson]

Gavin Henry wrote:

> 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.
>
You may also have to wait for a dial timeout at the handset while it 
decides whether you have finished entering digits. Some handsets have a 
'dialplan' you can program to recognize common combinations and bypass 
this delay.

regards,

Drew

-- 
Drew Gibson

Systems Administrator
OANDA Corporation
www.oanda.com