This is my problem as well. I have IMS and ExpressTalk behind an Axon PBX. Local calls are transfered to hold just fine, but when I call the PBX with my sell phone and transfer to hold, it plays for about 0.5 seconds, then goes away. Worse yet, when I unhold with ExpressTalk, audio now only goes one way. I can hear the phone, but I can't get out.
