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Transcript
Should SIP be modified to enforce per call billing? Christian Huitema Architect, Windows Networking Microsoft Corporation Why would we want to track usage? To bill for time, distance To allocate costs To predict network traffic To account for gateway usage Should we charge for Telephone Access? Yes! Telephone URL: “tel:12345678901” User directs “tel:” to selected service, Service checks user authentication, relays to “Phone-x” Phone-x completes the call, bills service Service bills user. SIP works just fine Phone-x RV Should we charge for IP network usage? A B Plain traffic? No, or not more than basic service! Premium traffic? Possibly! How to charge for premium network usage? B A Plain accounting, no control Application level control User marks TOS bits, network keep tabs. Side effect of call set-up, authorizes access. Network access control RSVP transaction, authorizes access. Pros and cons of three strategies (1) User based TOS: Easy to implement, but… Only feedback is monetary, monthly No protection against temporary congestion. Pros and cons of three strategies (2) Application level control SIP is not just for voice Feedback on a call per call basis, What of mid-call congestion? Need to derive network data from application data (fragile!). INVITE to Chat Room, Video Game Need decision for each media? SIP proxy need not be colocated with network access! Pros and cons of three strategies (3) Network access control SIP is not just for voice RSVP is designed to pass “network level” signalling Can use “pre-condition” in SIP Use QoS if and when needed Different decision for every media! Remote SIP proxy Use existing AAA framework to bill user of remote service Let’s not pollute SIP, keep a simple framework! SIP already enables billing for gateways, services. SIP is not just for voice, we don’t need to mimic the POTS behavior. Billing network resource is better handled by network protocols, RSVP.