[SIPForum-discussion] Unknown User

Broussard, Dan Dan.Broussard at Level3.com
Wed Jul 11 15:26:46 UTC 2007

In the call flow you have below it will be the originating PSTN switch
that plays the "3 tone message"
Here are the reasons;
1. Only signaling was passed between the PSTN switch and IMS
2. No call was ever set up
3. These are prerecorded messages on PSTN switches.
Dan Broussard
Level 3 Communications


From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of gurudatt balaji
Sent: Wednesday, July 11, 2007 9:59 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Unknown User

Hi All,
I've one query....
When PSTN user makes a call to IMS (unknown user), who is going to play
the announcement (saying wrong number/user) is it terminating switch
(IMS) or originating switch (PSTN switch)?
If it's PSTN, IMS will respond with 404-NON_FOUND and based on the
response PSTN will play with announcement
If it's IMS, how and what would be the logic?
Thanks in advance
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