So finally i've tested from a different location (Ya.com).I didn't note the router type, anyway....IT WORKS WITH SjPhone with no problems....everytime i initialize the connection.
So Telefonica must be blocking something, because i've found out that is blocking port 80 (it must be a policy to not use your comp as a webserver)
The TC-300 is not working still, i'm quite sure that is not sending even the login request, because if i have the same account logged in on SjPHONE or Betamax client, it will logout saying that another client has login with this username..But is not saying this when i'm trying with the phone...
I've tried with lowratevoip.com (
URL HERE)
General
SIP port : 5060
Registrar : sip.lowratevoip.com
Proxy server : sip.lowratevoip.com
Outbound proxy server : leave empty
Account name : your lowratevoip username
Password : your lowratevoip password
Display name/number : your lowratevoip username or voipnumber
Stunserver (option) : stun.lowratevoip.com
it's just that the phone has other options that are not listed on the site and i don't know how they are managed:
On NAT options it HAS:
STUN - enabled or disabled ...and if you enable it you put the stun.lowratevoip.com port 3478 and the RPORT (enbable disable)
When i enable the NAT settings it stays longer for authentification but in the end i get the same message (authentification failiure)
On the SIP settings it also has
RTP audio port: 30000
RTP pkt. period : 20
Prefered codec: G.711U G711A G.726-32 and G.726-24
I really , really don't know what's wrong with this..I just can't get it to work...(works on other SIP servers, tested with local ones)