Help please!! I've just got 3CX (free v10.0.24018.2322) set up using Grandstream GXW 4104 and Siemens Gigaset N300IP basestations with SL400 handsets. Everything seems to work fantatiscally well other than when transferring calls. Using the R button to initiate consultation, you can call another extension, but when using either the R button or Menu Selection to transfer the call, the caller is sent direct to the voicemail of the receiving extention. This happens both with attended and unattended transfers.... any ideas?? Also - call quality of external calls is not 100% - any ideas/help of best codecs/setting to use?