[cisco-voip] SIP NAT in CUBE with media flow-around?

[Chris Ward (chrward)]

Using media flow-around means you don't want the CUBE to terminate the media sessions so it flows directly from one side to the other. I think you are seeing exactly that. The CUBE is terminating the SIP sessions so CUBE will control all the SDP information. It sounds like the CUBE is by-passing NAT, and I would expect it to.

Why are you using Flow-Around mode?

+Chris
Unity Connection TME

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Roger Wiklund
Sent: Wednesday, November 07, 2012 6:33 AM
To: Cisco VOIP
Subject: [cisco-voip] SIP NAT in CUBE with media flow-around?

Hi

I've configured a CUBE that has a public IP on the outside interface and private in the inside.
I'm using media flow-around and PAT.

The problem is that SDP info sent to the ITSP contains the private IP. It seems that the CUBE is not NATing the SDP.

I have ip nat service sip udp port 5060 enabled, I also tried to disable it without any luck.
Also tried the piggyback stuff and sip-sbc nat stuff, nothing is working.

I'm beginning to suspect that NAT Traversal is not supported in flow-around mode.

Any pointers?

/Roger



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