Important note about SSL VPN compatibility for 20.0 MR1 with EoL SFOS versions and UTM9 OS. Learn more in the release notes.

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V18 Sip trunk

I am trying to set up a sip trunk with sophos v18. 

I have a cisco cube router behind sophos xg v18. 

The cube talks sip to cisco Call manager. 

What rules and nat is needed to connect the cisco router with Sip provider? 

I thought it would be as simple as making a nat dnat rule sending the sip traffic hitting our external ip address to the internal ip of the Cisco router. However it is not working as expected. 

I see the sip traffic hit the cisco router and then the sip traffic is continuing on to the call manager and ringing the internal phones. I can even answer the call. But then it disconnect within a few seconds. 

I see the cisco router is sending the sip OK back out to the provider but not seeing a ack back from the provider. 

Coming from ASA word i am used to natting in the ASA and seeing internal ip addresses hitting the cisco cube on the incoming invite.  But with the NAt in the sophos i am seeing the public ip hitting the cube in the invites? 



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