If you are trying to setup CUCM 6.1 with Broadvoice it may not work since CUCM only supports static SIP trunks. It will not register as a client to Broadvoice switch. Most likely Broadvoice BYOD needs the client to authenticate using username/password.
You can make it work if Broadvoice sets up a Trunk pointing to a static IP address that translates to your CUCM server.