Hari,
Yes, an example of where a SIT tone is used on the PSTN would be when
the caller has dialed a bad or non-existing number.
The SIT tone is generally played on the PSTN before a failure
announcement.
ITU recommendation E.182 defines tones that should be heard by the
caller in various situations the PSTN.
I've also pasted an excerpt of RFC 2833 for you about SIT:
3.12 Line Events
...
ITU Recommendation E.182 [13] defines when certain tones should be
used. It defines the following standard tones that are heard by the
caller:
...
Special information tone: The callee cannot be reached, but the
reason is neither "busy" nor "congestion". This tone should
be used before all call failure announcements, for the
benefit of automatic equipment.
...
When bridging between SIP and the PSTN you may want to use SIP
response codes for certain errors to trigger recordings that start
with SIT tones to be played to PSTN callers.
Bayan Towfiq
On Aug 8, 2007, at 12:31 AM, Hari Vuppaladhadiam wrote:
> Hi
> I wanted to understand when is SIT (Special Information Tone)
> played?
> Is this the error tone for BAd/Non-Existing number?
> Can anyone point me to relevant RFC?
>
> Regards
> Hari
>
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