Hello,
I have got such concern regarding location conveyance in SIP messages: I am
designing IMS Appilcation Server, acting as a proxy, that would query network
elements for location information. As you wrote proxies cannot insert message
body, so the only way is to provide location by reference. This requires
appling SUBSCRIBE-NOTIFY mechanism, which makes the architecture of the
solution quit complex.
In order to make it simpler I thought about including location information as
locationValue inside the Geolocation header. In fact we do not need location
represented with coordinates, but with cell-id (that's mobile network). PIDF-LO
does not support it, but maybe inside a header that would be possible? There
would be also an issue in indicating loaction target whose location is included
(we plan to include both A and B parties location). Geolocation header would
look like this:
Geolocation: {cell-id-3gpp} ;location-target="[EMAIL
PROTECTED]";inserted-by="[EMAIL PROTECTED]"
What do you think about souch a usage of Geolocation header, maybe you could
give us some other solution?
Thank you in advance,
Bartłomiej Kołakowski
Service Solutions Architect
Service Development Support Department
Polkomtel S.A
tel. 601131509
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