I followed the guide here
and my remote extension registers but when I try to make call I get return message 'Call Failed'
Now I suspect ports setup because at one point when I changed the SIP Extension configuration on Asterisk from the usual port 5060 for the extension, I managed to make a call even if it had sound only one way, then I tried to play with it some more and now I don't get any call through but simply get right away the Call Failed message on the remote phone display
I am trying with Aastra 480i which is behind Linskys WRT54GL router flashed with 'DD-WRT v24 VOIP' firmware which has Milkfish SER onboard and I don't think I could register Aastra extension without it
what puzzles me about ports is this - I have a trunk on asterisk connecting me to LesNet DID and that one uses port 5060, now I have two SIP estension and they both seem to require UDP port 5060 to be specified in their configuration, shouldn't each asterisk SIP extension be configured with different port?
on the remote end the Aastra phone needs port 5060 along with registration IP (I use FQDN having setup dyndns service at asterisk end), if I try different port like 5067 for example, Aastra won't register with asterisk at all and I don't get it, I mean I can't be using just port 5060 for everything can I? of course I have the usual ports forwarded to asterisk (UDP 5004-5082 & 10000-20000)
another confusing factor is that Aastra has Global SIP and Line1 -> Line9 configuration webpages and I have no idea what the Global SIP configuration is good for, I suppose that is simillar to most IP phones out there, I am configuring just Line1