asterisk users - Nov 2003 - PSTN intercepted announcement

Hi,

I have asterisk functioning as SIP to H.323 gateway for local SIP endpoints and
I have H.323 to PSTN
gateway (Lucent MAX TNT) connecting my LAN VOIP to PSTN via PRI.
Everything works fine with one exception. I seem to be unable to figure out why
I cannot hear
PSTN intercepted announcement  ("number is not in service" etc.) when
I'm calling
a disconnected number through asterisk. The phone just keeps ringing.
I know everything's fine with my PSTN connection and gateway, because I have
other
H.323 endpoints connecting directly to gateway without asterisk involved and it
works for them.
It seems that somehow both available h323 drivers for asterisk cannot handle
those messages.
I did some experimenting and found that H.323 FastFtart must be enabled in order
for this to work
(without faststart enabled it doesn't work for h.323 endpoints too). 
I tried to explicitly enable it on both h323 and oh323 drivers, but it
didn't work with asterisk anyway.
I'm not a telecom professional and I'm stucked here. So I thought
I'd ask for help here :)
Has anybody noticed this? Any ideas?
Thanks.
-- 
See you later,
                    Michael

Michael Ulitskiy wrote:
> Hi,
> 
> I have asterisk functioning as SIP to H.323 gateway for local SIP endpoints
and I have H.323 to PSTN
> gateway (Lucent MAX TNT) connecting my LAN VOIP to PSTN via PRI.
> Everything works fine with one exception. I seem to be unable to figure out
why I cannot hear
> PSTN intercepted announcement  ("number is not in service" etc.)
when I'm calling
> a disconnected number through asterisk. The phone just keeps ringing.
> I know everything's fine with my PSTN connection and gateway, because I
have other
> H.323 endpoints connecting directly to gateway without asterisk involved
and it works for them.
> It seems that somehow both available h323 drivers for asterisk cannot
handle those messages.
> I did some experimenting and found that H.323 FastFtart must be enabled in
order for this to work
> (without faststart enabled it doesn't work for h.323 endpoints too). 
> I tried to explicitly enable it on both h323 and oh323 drivers, but it
didn't work with asterisk anyway.
For the case of OH323, can you send me more details
(conf file, log, tracefile) to check it?
> I'm not a telecom professional and I'm stucked here. So I thought
I'd ask for help here :)
> Has anybody noticed this? Any ideas?
> Thanks.
Michael.

Michael Ulitskiy wrote:
>Hi,
>
>I have asterisk functioning as SIP to H.323 gateway for local SIP endpoints
and I have H.323 to PSTN
>gateway (Lucent MAX TNT) connecting my LAN VOIP to PSTN via PRI.
>Everything works fine with one exception. I seem to be unable to figure out
why I cannot hear
>PSTN intercepted announcement  ("number is not in service" etc.)
when I'm calling
>a disconnected number through asterisk. 
>
AFAIK, A PRI is normally expected to signal number not in service 
conditions out of band, so * should be signalling the out of service 
condition in a manner appropriate for the channel type (as a recording, 
or as the most accurate protocol specific out of service response code 
available, casung the out of service condition to be indicated by the 
target equipment)

With my SNOM phone, the PRI signals not in service or no route or 
whatever, then * relays that in the form of a SIP error response, then 
the SNOM phone executes an internal recording and shows the error on the 
display as well.

This results in more reliable call handling all the way through, and 
some bandwidth savings.