Bug ID 788005: Bypass MRF SIP LB restriction of conversion from reliable transport (TCP) to unreliable transport (UDP)

Last Modified: Nov 22, 2021

Bug Tracker

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

Known Affected Versions:
14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,

Fixed In:

Opened: May 30, 2019
Severity: 4-Minor


The SIP RFC states that if converting a message from a reliable transport to an unreliable transport, the proxy must guarantee delivery.


A system db variable was added to disable the TCP to UDP protection.


A adminstator required conversion of SIP messages from TCP to UDP and was willing to forgo the delivery requirement.



Fix Information

A DB variable has been added, Tmm.Sp.Sip.AllowTcpUdpConversion, possible values are enable|disable, the default value is disable. Enabling the DB variable enables the protection blocking TCP to UDP conversion for SIP messages.

Behavior Change