Mine does the same thing, will not transfer. Using a voicemodem i am able to get it to hookflash and transfer my call to my cellphone which is pretty cool but no luck getting it to tranfer to a VOIP extension.
I can call IVM from an IP phone on my network press an option and have it transfer me to another extension
When I try an incoming call via my fxo it seems like it does a hookflash or something does not tranfer correctly.
Found the Fix, in Sipura go to PSTN and use outbound proxy set it to the Axom server IP also set use outbound proxy and dialog both to yes.
Works now.
