I've asked this question twice already without being able to resolve it
I have been trying to connect a 7940 at a remote user behind a Draytek 2820 adsl router to a cisco 2811 switch. which is also behind a Draytek 2820
First of all I amended the configurion of the 2811 on local site and connected the new 7940 handset - works
Then I connected it to a second adsl router on site (effectively a remote site with its own IP)
(That is not the ultimate intention but at least I can test without having to travel!)
The 7940 loops between 'configuring CMList and looking for TFTP server. I reset it to defaults in accordance with instructions I found when googling but got stuck at 'configure SIP settings' The TFTP setting on the 7940 is the external IP of the local site with the 2811. I suspect it does not get past the Draytek, but I don't know what port it requires.
What does a remote 7940 need in order to connect to a local 2811
What ports need to be opened in the firewall (Draytek 2820 on both remote and local network)
What changes are needed on the cisco 2811 to allow this.