> On Sat, Mar 3, 2018 at 7:33 PM, Dale R. Worley <[email protected]> wrote:
>
>> Zuniga, Guillermo <[email protected]> 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
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