Bug ID 813657: MRF SIP ALG with SNAT incorrectly detects ingress queue full

Last Modified: Jun 30, 2021

Bug Tracker

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

Known Affected Versions:
13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1

Fixed In:
13.1.3.2

Opened: Aug 09, 2019
Severity: 3-Major

Symptoms

When SIP ALG processes a non-registered subscriber SIP outbound call, the ingress queue counter may underflow. This is interpreted as ingress queue full and the rest of message will be dropped.

Impact

SIP ALG incorrectly detects the ingress queue is full and stops processing the rest of SIP ALG traffic.

Conditions

SIP ALG processes non registered subscriber SIP outbound calls (nonregister-subscriber-callout option is enabled in SIP session profile).

Workaround

None

Fix Information

When SIP ALG processes non registered subscriber SIP call, the ingress queue counter is handled correctly.

Behavior Change