I am in need of desperate help. I have 7 pcs all have Zoiper on. I have 5 that can connect to the dialer via zoiper but I can't get the other 2 pcs to connect. They pass all the pc & zoiper checks but soon as I try to log on the 6th or 7th to the dialer its rings but I can't hear customers and they can't hear us. Now I have fought with the people on our broadband. They have said the speed is fine and router. Windows said its a zoiper issue and our dialler said everythinh is fine on there back end suggesting its a zoiper software issue however I am mot convinced it is. Reason been 5 work and the other 2 have passed tests. Can someone pleeeeease help or point me in the right direction.
This sounds like a NAT network issue. Please go to the zoiper account settings, click on advanced and try different settings for rport and stun, this will most likely resolve your issue.