I have a Unity 5.0(1) server we've just setup to replace our existing system. I have it connected to one of our NEC NEAX 2000 IPS PBXs via a Dialogic PIMG 1008LS with serial integration through the PIMG.
I have integration working and most everything seems fine. But if I call Unity and enter an extension the blind transfer fails.
If I watch on the port status monitor is shows it tries a xfer then plays the subscriber greeting then hangs up and the caller ends up getting the opening greeting. During all that the caller only hears MOH with a brief cut out and the subscriber extension never rings.
I'm hoping I'm just missing something easy.
Traces from the PIMG might tells us more but my initial guess would be that the PBX is sending a special (stutter?) dialtone when PIMG does the hookflash to initiate the transfer. PIMG could see this as an error tone rather than dialtone, which would cause the transfer to fail.