My phone system was working fine a few weeks ago until suddenly on outgoing calls the remote party could not hear me. I talked to my VOIP provider and they said that it could be because my box was using a strange port (49558) rather then one within the 10,000 to 20,000 range. I checked all my settings but I am still not sure why that port is being used. I put my box in the DMZ and the calls work.
Any idea why its using this non-standard port?