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RFC 3329, "Security Mechanism Agreement for the Session Initiation Protocol (SIP)", January 2003

Note: This RFC has been updated by RFC 8996

Source of RFC: sip (rai)

Errata ID: 2169
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: Peter Dawes
Date Reported: 2010-04-23
Held for Document Update by: Robert Sparks

Section 4.1 says: 

The 200 OK response (6) for the INVITE and the ACK (7) are also sent
   over the TLS connection.  The ACK will contain the same Security-
   Verify header field as the INVITE (3).

It should say:

The 200 OK response (6) for the INVITE and the ACK (7) are also sent
   over the TLS connection.

Notes:

RFC3329 Section 2.6, Table 1: Summary of Header Usage. indicates that Security-Client, Security-Server, Security-Verify are "Not applicable" to the SIP ACK request.

RFC 3261 says (section 20) "Not applicable" means that the header
field MUST NOT be present in a request. If one is placed in a
request by mistake, it MUST be ignored by the UAS receiving the
request.

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