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RFC 3325, "Private Extensions to the Session Initiation Protocol (SIP) for Asserted Identity within Trusted Networks", November 2002

Source of RFC: sip (rai)

Errata ID: 5499
Status: Reported
Type: Editorial
Publication Format(s) : TEXT

Reported By: Richard Phernambucq
Date Reported: 2018-09-20

Section 10 says:

   * F4   proxy.cisco.com -> proxy.pstn.net (trusted)

   INVITE sip:+14085551212@proxy.pstn.net SIP/2.0
   Via: SIP/2.0/TCP useragent.cisco.com;branch=z9hG4bK-124
   Via: SIP/2.0/TCP proxy.cisco.com;branch=z9hG4bK-abc

It should say:

   * F4   proxy.cisco.com -> proxy.pstn.net (trusted)

   INVITE sip:+14085551212@proxy.pstn.net SIP/2.0
   Via: SIP/2.0/TCP proxy.cisco.com;branch=z9hG4bK-abc
   Via: SIP/2.0/TCP useragent.cisco.com;branch=z9hG4bK-124

Notes:

As per RFC 3261, chapter 16.6, step 8:
The proxy MUST insert a Via header field value into the copy before the existing Via header field values.

The order of Via headers should be reversed. This applies to the following message examples:
chapter 10.1: F4, F5
chapter 10.2: F4, F5, F6

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