SIP proxy RTP issue

Hi Devcentral,

I would like to ask your help for a difficult issue with SIP load balanced through F5.

The scenario si the following:

BIG-IP acts as a SIP proxy for SBCE (Internet to SBCE)
BIG-IP use source NAT for server side connection
SIP Registration is fine, RTP audio connection is not working.

I tried to dig in devcentral without any working solution, so it could be very tricky or very simple, maybe I am missing something.

I tried everything and I think the issue is related to SDP IP addresses in SIP payload, I need to replace the IP addresses embedded with the SNAT IP of the F5. I tried to use the following parameters https://devcentral.f5.com/wiki/iRules.SDP__media.ashx but without any success.

Thank you in advance.