Aastra 9133i, Asterisk, and NAT: How to make it work?

Asterisk Asterisk Support
1

I’ve been pulling out my hair all day on this one. If anyone can help, I’d really appreciate it. :frowning:

I’ve got an Aastra 9133i (with the latest firmware version) and a Cisco 7960 sitting behind a NAT device on my LAN. The Asterisk server is hosted offsite and has a public IP address.

I’ve set up port-forwarding on the firewall for both phones to tunnel the SIP messages initiated by the Asterisk box. It works like a charm with the Cisco phone by using the following config info:

voip_control_port: 5077
nat_enable: 1
nat_address: ""
nat_received_processing: 0

Every time the Cisco phone registers with Asterisk, it does so using port 5077 and with the corresponding port-forwarding rule added to the firewall, it works great. However, for the life of me, I can’t get the Aastra to do the same thing. I thought that should be able to do it by using “sip nat port: 5078” in the Aastra config file, but no dice.

Any suggestions, please?