> On Sat, Mar 3, 2018 at 7:33 PM, Dale R. Worley <wor...@ariadne.com> wrote: > >> Zuniga, Guillermo <guillermo.zun...@cwpanama.com> writes: >> > I Access enviroment not PEER to PEER connection, CONTACT could be >> > anonymous or always should be any valid uri-user? >> >> The Contact always has to be a valid URI. However, that URI does not >> have to be the AOR (address-of-record) of a customer; it just has to be >> able to reach the UA (when used by the next proxy in the signaling >> path).
There are a lot of complexities. Certainly, the Contact has to be a syntactically correct URI. But there are various ways to avoid divulging user-sensitive information. See 3323 A Privacy Mechanism for the Session Initiation Protocol (SIP). J. Peterson. November 2002. (Format: TXT=54116 bytes) (Status: PROPOSED STANDARD) (DOI: 10.17487/RFC3323) 5379 Guidelines for Using the Privacy Mechanism for SIP. M. Munakata, S. Schubert, T. Ohba. February 2010. (Format: TXT=52595 bytes) (Status: INFORMATIONAL) (DOI: 10.17487/RFC5379) 5767 User-Agent-Driven Privacy Mechanism for SIP. M. Munakata, S. Schubert, T. Ohba. April 2010. (Format: TXT=23270 bytes) (Status: INFORMATIONAL) (DOI: 10.17487/RFC5767) Dale _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors