I am replacing my current Tadiran PBX with a Shoretel IP phone system. I am trying to integrate the two so that I can migrate users over as they finish training. My problem is that when I call a Tadiran phone from a Shoretel phone if the voicemail picks up the call gets dropped. I have tried telling it to go to a public library instead of the vm and programmed the library to call the vm. It still drops the call as soon as the Vm picks up. Any help would be hot. Thanks.