asterisk users - Feb 2007 - Long call setup times on SIP to zaptel calls

I have had a lot of complaints about the time it takes to setup a call.
I have timed it and it is almost five seconds before it even starts
ringing. The SIP device sends the request almost instantly but the
channel is taking a long time to pickup and dial. It wouldn't be so bad
but they hear nothing. I would like to provide ringback before the
zaptel actually starts ringing the channel. Has anybody done this, it
seems like it would be a zaptel option.
 
Jordan Novak
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>From: "Jordan Novak" <jnovak@logisticshealth.com>
>Date: Thu, 15 Feb 2007 13:45:39 -0600
>
>I have had a lot of complaints about the time it takes to setup a call.
>I have timed it and it is almost five seconds before it even starts
>ringing. The SIP device sends the request almost instantly but the
>channel is taking a long time to pickup and dial. It wouldn't be so bad
>but they hear nothing. I would like to provide ringback before the
>zaptel actually starts ringing the channel. Has anybody done this, it
>seems like it would be a zaptel option.
>
>Jordan Novak
A local ring back is built in Dial()'s r option.  The problem with this is 
that the caller is never going to hear the real ring back.  I haven't 
figured out a good strategy to deal with this caveat.  Suggestions?

Yuan Liu

do your sip phones dial after a timeout?  If the timeout is set to
around 5 seconds you may have a dialplan issue on your sip hardware.

Shane

On 2/15/07, Jordan Novak <jnovak@logisticshealth.com>
wrote:
>
>
> I have had a lot of complaints about the time it takes to setup a call. I
> have timed it and it is almost five seconds before it even starts ringing.
> The SIP device sends the request almost instantly but the channel is taking
> a long time to pickup and dial. It wouldn't be so bad but they hear
nothing.
> I would like to provide ringback before the zaptel actually starts ringing
> the channel. Has anybody done this, it seems like it would be a zaptel
> option.
>
>
> Jordan Novak
>
>
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>

One thing I've noticed with SIP -> ZAP calls for quite some time is that 
  when asterisk is dialing n digits out the zap line, it dials n-1 
digits, pauses for *TWO* seconds, and then sends the nth digit.  Doesn't 
matter how many numbers I want to send out the ZAP channel, this always 
seems to happen.

Asterisk 1.2.x is affected for sure.  I haven't tested 1.4 yet.  But if 
we could get this figured out, that would shave two seconds off MY 
nearly-five-second setup time.

Mojo

P.S. Polycom Soundpoint 501, TDM w/ 4xFXO, Asterisk 1.2.13

Jordan Novak wrote:
> I have had a lot of complaints about the time it takes to setup a call. 
> I have timed it and it is almost five seconds before it even starts 
> ringing. The SIP device sends the request almost instantly but the 
> channel is taking a long time to pickup and dial. It wouldn't be so bad
> but they hear nothing. I would like to provide ringback before the 
> zaptel actually starts ringing the channel. Has anybody done this, it 
> seems like it would be a zaptel option.
>  
> Jordan Novak
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> --Bandwidth and Colocation provided by Easynews.com --
> 
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users

On 2/15/07, Jordan Novak <jnovak@logisticshealth.com>
wrote:
>
> I have had a lot of complaints about the time it takes to setup a call. I
> have timed it and it is almost five seconds before it even starts ringing.
> The SIP device sends the request almost instantly but the channel is taking
> a long time to pickup and dial. It wouldn't be so bad but they hear
nothing.
> I would like to provide ringback before the zaptel actually starts ringing
> the channel. Has anybody done this, it seems like it would be a zaptel
> option.
>
> Jordan Novak
I'm not sure if it's related, but we are doing only SIP to SIP calling
with Asterisk 1.4 and experience the same thing. The signaling shows
up instantly, but it takes 5-7 seconds before ringback is heard.
Watching the CLI it does look like it takes a long time for the
channel to pick up an dial.

regards,
David