Bug ID 748043: MRF SIP ALG with SNAT: SIP Response message not forwarded by BIG-IP

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,, 14.0.0,,,,,, 14.0.1, 14.1.0,

Fixed In:

Opened: Oct 26, 2018
Severity: 3-Major


SIP Server sends SIP Request to the client. The SIP Server inserts a different port, so that response are received on a different port. The Client sends the response on the new requested port. BIG-IP drops the packet


SIP Request will not receive the SIP Response


SIP Server wants the SIP Response to be coming on a different port.


There is no workaround.

Fix Information

Fix BIG-IP to process the SIP Response and send it to the SIP Server

Behavior Change