[Asterisk-Users] PSTN intercepted announcement

[Josh Rollyson]

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.