[Sip] geoloc implementation (Was: SIPit 20 survey summary)

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Is this really as much of a problem as people are making out?

OK, it's *possible* that redesigning the geolocation specification
would be a good thing.  But given the amount of work that has already
been done on it, and the complexity of the requirements, it would take
me a month of work straight to verify that I truly had a Better Idea.
So I am not about to suggest that.

In regard to the complexity of the solution, a UA that provides geoloc
data (once it had some) would seem to have a fairly simple task,
formatting the data into a preselected body.  Even multipart-MIME XML
is simple if one knows in advance the skeleton.

The PSAPs, of course, are stuck parsing and interpreting all possible
formats.  That's a hard job, but on the other hand, PSAPs are built by
a small number of vendors who will be highly motivated to do a good
job.  (And PSAPs are willing to pay for this.)

The difficulty in practice is "How does the UA get its geloc data?"
(Or how does an intermediate agent get the data for the UA?)  This
does not become simpler if we change the format of geoloc data.

I expect that the major barrier to implementing geoloc support has
been the instability of the geoloc specification, combined with the
fact that SIP is not yet entering the mainstream where emergency
services support is required by regulation.

Dale


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