Forum Discussion

rolf's avatar
rolf
Icon for Cirrus rankCirrus
Aug 03, 2014

Source port of SIP UDP request gets translated regardless of source port setting 'preserve strict'

Hi Guys,   I configured a SIP (UDP) service on a 11.5.1 HF3 LTM at a customer site. A SIP profile is bound to the SIP Virtual Service. The LTM ist set up in the L3 Path. Most of the VS configurati...
application delivery
deployment
LTM
sip
source port translation
Vsevolod_Petrov's avatar
Vsevolod_Petrov
Icon for Cirrostratus rankCirrostratus
Jul 02, 2015

There's a note in the official SIP Deployment Guide available at https://www.f5.com/pdf/deployment-guides/load-balancing-sip-dg.pdf that states the following: 

One example of a scenario this guide would not cover is for SIP UDP where
clients and servers always use a source and destination port of 5060.
Contact F5 technical support for configuration guidance for such use cases.

Did you try to contact?

Setting Idle Timeout to Immediate helps, but you loose packet in reverse direction and auto-lasthop also becomes unavailable.