I can not find my previous thread on this... sorry I finally have remote extensions working with 2 way voice on a Yealink T22. On the remote extension I had to change transport from UDP to TCP. However - it can not Transfer or Hold calls. They get put into never-never land (other end still shows active call - but remote extension can't get them back). Also, all outbound calls terminate in 30 seconds on the remote extension - both internal and external. I see this in the 3cx log file. Notice the top line, about 30 seconds after "Active Call" it realized no ACK has been recieved. I've tried different options with Supports Re-Invite and Support Replaces header to no avail. Any ideas? Thanks.