I am using Zoiper Biz for Windows 2.0 with g729 and have been for some time now. It is for a small call center with two operators on separate PC's. From around 3 months ago a new issue a raised where after the user has answered the call and speak they can hear a dial tone. It happens only when the Zoiper user speaks into the microphone and makes it impossible to have a conversation.
It does not happen with all calls just sometimes. I have tried; reinstall, removing config file, Only having one service activated at the one time, changing STUN to on and off and changing pretty much every setting available but to no avail.
Please help!