SIP Trunk Question

[phoneDTC]

I am attempting to eliminate an aging SBC between a IPO R11 and firewall.
The SIP Trunk provider is pointed to a dedicated public IP which is NATed to the SBC LAN1. I have pointed the ITSP Proxy Address to the SIP provider. In the ARS table, I modified the statements to include my IP address (Example N“@ MY_PUBLIC_IP”). The trunks seem to come up on the IPO but no calls on inbound or outbound. The carrier is saying that I need to show our public IP in the SIP header. Do I need to set this up somewhere else? Any advice would be much appreciated.

 

[msalvary]

You can start by capturing a trace from the Monitor application for an outgoing call, and share this with the Service Provider. Make sure you you enable SIP options in the Monitor filter options before starting the trace. Hopefully from the trace, they can tell you what is specifically required.

 

[phoneDTC]

Thank you for your response, I will try that this evening. They are telling me they are not receiving my public IP in the SIP header. Reading some other posts I am wondering if I need to do something with the STUN server. I am not clear exactly what this does or how it needs to be configured. Any advice?

 

[TouchToneTommy]

LAN-1 Network Topology, BLANK out the STUN server address (and ignore any error message), enter your Public IP address, Binding Refresh Time = 60, UDP and TCP to 5060, and Firewall Type Unknown.

SIP Line Transport Network Configuration Use Network Topology Info LAN-1

Now the IPO will compose the SIP messages that it sends out with your Public IP address instead of your internal IP, and the SIP Provider will know where to send traffic.

 

[phoneDTC]

Thank you Tom - I will try that this evening and report back to you.