1. URI and header field Parameter Registries draft-camarillo-sip-parameter-registry-01.txt draft-camarillo-sip-uri-parameter-reg-00.txt Gonzalo.Camarillo@ericsson.com

2. Parameters to be registered RFC 3261 did not define an IANA registry for parameters –URI parameters sip:alice@atlanta.com;comp=sigcomp –Header field parameters Via: SIP/2.0/UDP server1.foo.com:5060 ;branch=z9hG4bK87a7;comp=sigcomp

3. Usefulness of the registries Avoid collisions –Parameters with the same name but different semantics Implementers guide –Which parameters are defined for a particular header field or for SIP/SIPS URIs

4. Open Issues Which URI parameters need to be registered? –Only RFC-defined parameters Both standard and informational –All parameters Including proprietary ones together with a small description of the parameter Same question for header field parameters