Bug ID 432735: SIP ALG: TCP client reusing a connection following a call results in mblb internal error

Last Modified: Apr 28, 2025

Affected Product(s):
BIG-IP TMOS(all modules)

Known Affected Versions:
11.4.0, 11.4.1

Fixed In:
11.5.0, 11.4.1 HF2

Opened: Oct 03, 2013

Severity: 3-Major

Symptoms

A TCP reset results when a SIP client attempts to use the same TCP connection for a call and subsequent register request.

Impact

No more RST of the ALG clients using TCP.

Conditions

The RST is initiated by the BIG-IP and sent to both clients taking part in the communication. This results in disrupting the SIP proxy connection already established by both clients.

Workaround

None.

Fix Information

The RST of the two ALG clients no longer happens.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips