Hi

I have Ser Express router on a Public ip address with no firewall between it and the internet.

I have two hardware phones and two software clients connecting to the SER box.

All 4 clients are on a private network with Nat connecting to a gateway on a public ip address in the same range as the Ser Unit.

They register and I can make calls between these 4 clients.

When I go to a remote location on a different ISP.

I check the computer is on a public IP and no firewall is enabled. I place my SER details for registration into the client and it fails to register.

I tried xlite with its debug screen and I see the send but note no response.

When I use ethereal I capture the send but note no response packet received.

I have tried a couple of port scans from the internet and I confirm port 5060 is open and listening.

I have an Asterisk box on a public ip address also in the same range as the SER unit. It registers to SER and ser routes calls to it and bridges SIP – H323 out to a Gatekeeper and calls work within normal limits.

What am I doing wrong?

SERWEB is working and the website etc… all work from the internet no issue.