asterisk users - Feb 2006 - SPA-3000 VOIP-PSTN gateway - long delay between answering and ringing

Greetings,

We are currently testing a Sipura SPA-3000 as a gateway from our 
Asterisk system to a PSTN line for 911 access. We have a number of 
locations and want to place an SPA-3000 in each, connected to a PSTN 
line that will provide the correct ANI/ALI information to 911 for each 
location.

It all works great, except for a reasonably significant (4 seconds) 
delay between when the SPA-3000 answers the SIP call from the Asterisk 
server (immediately upon dialing, according to the Asterisk CLI) and 
the ringing tone begins (the remote phone begins ringing at that same 
time).

The delay is enough for users to think that the phone isn't working - 
not what you want for 911!

Any ideas?

Regards,
-- 
Anthony Rodgers
Business Systems Analyst
District of North Vancouver
Web: http://www.dnv.org
RSS Feed: http://www.dnv.org/rss.asp

Anthony Rodgers a ?crit :
> Greetings,
>
> We are currently testing a Sipura SPA-3000 as a gateway from our 
> Asterisk system to a PSTN line for 911 access. We have a number of 
> locations and want to place an SPA-3000 in each, connected to a PSTN 
> line that will provide the correct ANI/ALI information to 911 for each 
> location.
>
> It all works great, except for a reasonably significant (4 seconds) 
> delay between when the SPA-3000 answers the SIP call from the Asterisk 
> server (immediately upon dialing, according to the Asterisk CLI) and 
> the ringing tone begins (the remote phone begins ringing at that same 
> time).
>
> The delay is enough for users to think that the phone isn't working - 
> not what you want for 911!
>
> Any ideas?
You could use the 'r' flag in your Dial() command to simulate a ringing 
tone instantly. This is less than ideal though. Have you done some SIP 
traces (using ngrep for examples) to look when the SIP 'ringing' signal 
is actually being sent?

Cheers,
Jean-Michel.

-- 
Jean-Michel Hiver - http://ykoz.net/
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