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Contact Header

Contact Header

Contact Header

Hello everyone,

For some reason I can get version 8.0 (46) to show the correct Contact header information, as shown below:

Contact: <sip:72777XXXXX@;transport=udp>;expires=60

It is showing the internal IP and I have tried the following:

Use Network Topology Info (both) LAN1 and NONE

Under Network Topology I have as STUN server "Full Clone NAT" (Also tried Open Internet) and the public IP Address as my public (STATIC) IP.

I even tried putting the External IP in the ITSP Proxy Address.

Have any suggestions?

Thanks everyone!!


RE: Contact Header

Just an update:

Adding a STUN server (Tried a few different ones) corrects the Contact Header format and changes the Firewall/NAT Type to "Port Restricted Cone NAT" and sets the Public Port to 49153. When the STUN server set the Public Port to 49153 I get no audio. I set the Public Port back to 5060 and
remove the STUN server IP and then everything is great except the Contact Header format reverts back to my internal LAN IP and long distance calls are hit or miss.

Also I am using LAN1, my ARS rule is N"@sip.privder's.domain

Contact: <sip:72777XXXXX@;transport=udp>;expires=60 <-- Do not want
Contact: <sip:72777XXXXX@XXX.XXX.18.150:5060;transport=udp>;expires=60 <-- Want

Any thoughts?


RE: Contact Header

I am still fighting this problem, any help would be greatly appreciated!!

I sent a trace to Flowroute and this was their response.

Thanks for the capture. The capture shows that your system is showing your private IP address in your signaling SIP Contact header, which causes no audio or one-way audio intermittently, especially when calling toll-free number.
Please modify your system to show your public IP XXX.XXX.18.150 as the SIP contact header.
Below is a general guide that explains how to do this on common Asterisk-based systems.

Flowroute Support

Thanks again,


RE: Contact Header

Try this

In network topology
Set firewall type to Static port block
Remove the stun server and uncheck run stun on startup
Enter public IP address into public IP field
change ports to 5060

SIP Line
Change Use Network Topology info to LAN1 (or LAN2 if that is the connection to your SIP)

This should present your public IP to your SIP provider. If that does not work try firewall type as Port Restricted Cone NAT or Open Internet.

RE: Contact Header

Thank you for responding Critchey,

I have tried most of what you suggested except Static port block.

I will give that a shot and let you know.


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