VX Call Flow
The VX call flow process is shown below
The First Call from the Public Switched Telephone Network
The first call from the PSTN is processed as shown below.
The PSTN Call as Seen by VXbuilder
To VXbuilder, the call looks like the flow shown below.
The First Call from a Public Branch Exchange
The first call from a PBX flows as shown below.
Configuring a Trunk Group to Support a PBX
A PBX connection will likely employ a different ISDN protocol than typically configured. QSIG is a common PBX interconnect ISDN protocol. To edit your configuration to accommodate this change, select the appropriate port in VXbuilder as shown below.
Changing Your Trunk Group Configuration
Click Edit and make the necessary configuration changes (highlighted) as shown below
Editing the PBX Port Configuration
Click Transmit to have your changes take effect.
PBX Call Flow as Seen by VXbuilder
From VXbuilder, the call flow looks as shown below.