Hello, I just went live with my 3CX setup yesterday, and although it seemed to work fine, I've had some problems today. Basically I hear the other party (external) intermittently, while they say they hear me perfectly. Internal calls (from extension to extension) are heard perfectly. My setup is as follows: * 3CX's PSTN lines are actually extensions in an analog Panasonic PBX, but that worked fine during tests and yesterday. * 3CX server is inside a LAN, where all the softphones are (there is one remote softphone -- it worked yesterday and I have not tested it today). It's a physical machine running Windows 2008 R2. * I am using a Grandstream GXW-4104 gateway Any ideas? Thanks in advance.