Hi,
I have the following queries regarding emergency call interpretation at
SIP Application Server (SIP-AS).
scenario:
========
AP- Access Point
AS - SIP Application server
MGCF - Media Gateway Control Function (Softswitch )
PSAP - *Public Safety Answering Point
*AP<----SIP--->AS<---SIP----->MGCF<----Non-SIP---->PSAP
Use case1 : When subscriber(AP) makes emergency call to PSAP (AP
------->PSAP)
Use case2 : When PSAP callbacks to subscriber. (PSAP ------->AP)
Now Questions related the mechanisms for analyzing the emergency calls at
SIP Application Server. By considering the cases of emergency call numbers
are different in different countries and context.
Option 1: SIP-AS can do the digit analysis from request uri of the userpart
(ex: 911) and figureout the call as emeregncy and handle the call.
Option 2 : If the AP/MGCF done the digit analysis and add the "priority :
emergency" header, SIP-AS can rely on that header and route the call.
So which option is suitable in context of SIP-AS implementation for
emeregency calls.
Thanks in advance.
Regards
Channa
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