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Some Observations
Some of the things people want to use service tags for are for information usually in SIP but sometimes not there in corner cases
Offerless INVITEs
Missing media properties (latency)
If these were always present, and two SIP INVITEs for different services looked the same, you must have missed something
Do What I Say and *not* Do What I Mean
So if they were always different, the service is really a ‘summarization’ of what is there
PPT Version