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Why are folks bothered so much by this? If many aspect of system behavior drive off of this single parameter QoS, charging, feature servers, app dispatch, etc. What happens when A ‘regular’ SIP phone calls a SIP phone in a provider network that requires these service tags? A call takes place between two providers that have different tags for the same service? A call takes place between two providers that have different services but overlap in some way (both use IM, audio, etc.)? |