Bug ID 465133: SIP-ALG: When Proxy authentication is enabled, SIP-ALG will not set up media flows

Last Modified: Nov 22, 2021

Bug Tracker

Affected Product:  See more info
BIG-IP CGN(all modules)

Known Affected Versions:
11.5.1, 11.5.0, 11.4.1, 11.4.0, 11.3.0

Fixed In:
11.6.0, 11.5.2

Opened: May 30, 2014
Severity: 2-Critical
Related Article:


SIP sessions fail to setup media flows.


SIP media sessions are not established.


This occurs under the following conditions: -- SIP-ALG is configured on a virtual server. -- SIP client and server exchange more than one INVITE, and the second INVITE has a new cseq number. This can happen when the Proxy is requiring authentication from the client.



Fix Information

SIP-ALG now keeps track of the second INVITE and sequence number and recognizes the 200OK.

Behavior Change