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One way audio - SIP/NAT Issues

L0 Member

Hi All


I've been battling for the past couple of weeks to get a SIP based telephone system to work through my client's PA-220. 

I have the NAT and Security Policies set up correctly to allow the SIP traffic to flow on port 5060. However, the RTP traffic is only allowing outgoing voice. The ports being requested by the VoIP provider for RTP 7000-7031, 7100-7131 and 7300-7331. 

SIP-ALG is disabled. When I enable it, there is no voice in either direction.

Has anyone had this issue? Some pointers in the right direction would be amazing.

Thanks in advance


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