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Problem with NAT for SIP through Firewall

Hi folks,

 

I have the following topology;

IP Phones--->Call Manager--->Cisco CUBE--->Firewall ASA--->Internet<---VOIP ISP.

 

We want to establish a SIP Trunk between the CUBE and the VOIP ISP. We already managed to register with the ISP, but we can´t establish calls through it. We confirmed that we have enough credit to make calls.

It seems like a problem with the NAT in the Firewall, as it is not being able to change the private IP address in the SIP Payload.

Can anyone help me solving this?

 

Thanks in advance

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