Except that it won't go to a mailbox when transferring to a calling group. The transferred call will ring in the group until answered or abandoned. OR, you can purposely mis-program the "transfer return extension" setting for 78 and 79, to point back to themselves instead of Ext. 10. This will cause the transfer to a calling group to return to the VM port that sent it, but without mode codes. The VM will go to its fall back position of "Transferring Call to the Operator", send it to Ext. 10, and cover to 10's voice mail.