Bug ID 566930: Registration message is required for a SIP ALG call to be processed by the BIG-IP system.

Last Modified: May 01, 2019

Bug Tracker

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

Known Affected Versions:
11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 11.6.3,,,,, 11.6.4, 12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3,,,,,,,, 12.1.4,, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,,, 13.1.1,,,,,

Opened: Jan 11, 2016
Severity: 4-Minor


If the internal client (subscriber) is unregistered, then any SIP call to/from that particular subscriber is dropped by the BIG-IP system SIP-ALG. SIP-ALG requires subscribers to be registered with their proxy servers through the BIG-IP system, because it uses those messages to maintain a table of valid subscribers and their translated addresses.


SIP Call does not get established, since the messages gets dropped. Although this is as-designed behavior, the system does not post detailed messages to the logs that indicate that this behavior occurred.


Subscriber makes/gets a SIP call without registering with their proxy servers through the BIG-IP system.


None. This is functioning as designed.

Fix Information


Behavior Change