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="bob at plus.pl";inserted-by="las at plus.pl"
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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