I have just set up a computer with a 3G internet connection to the world. (I am Rural .. no wired internet)
I am trying to get a reliable VOIP phone service over this interface. I am finding that when I dial out, I get dial tone, dial the number, then after a few seconds I get a disconnect. Sometimes the other end will answer, then disconnect.
I am using a Linksys SPA2102 phone adapter.
Calls-in are fine .. just calls-out are the problem.
I have made sure all the SIP ports are open on the firewall for the VOIP service. According Xnet my Voip provider they are seeing that my phone interface is not responding on the ports .. is it possible that Telecom is blocking the SIP ports?
However, I can use Gtalk phone out from a computer just fine ... and that is using SIP too right? Maybe Gtalk is using different ports?
I have seen on this forum a two year old post that states that someone else had the same issue as me, but did not
resolve it. Another poster said that the Cisco SRP521 had no issues over 3G.
But before I buy the Cisco, is there any settings I can try tweaking on the SPA2102?