Overview
The voice entity configuration involves:
POTS voice entity configuration
VoIP voice entity configuration
According to the position of the caller or callee, a complete telephone-to-telephone connection can be divided into four call segments, each of which corresponds to a voice entity.
Figure 4: Two types of voice entities in the VoIP voice communication
Figure 4 shows that two types of voice entities are involved in VoIP communication:
POTS voice entity—This type of voice entity corresponds to the local telephone or PSTN side. POTS voice entity configuration is required to establish connections between physical voice subscriber-lines and local telephone devices.
VoIP voice entity—This type of entity maps telephone numbers with destination addresses. Contrasted to POTS voice entity, it resides at the IP side. You can configure a VoIP voice entity to use the SIP or H.323 protocol to make VoIP calls.
Besides the POTS and VoIP voice entities, the device also supports VoFR entity and IVR entity. A VoFR entity is used to transmit voice data over a frame relay network, and an IVR entity is used to set a customizable interactive voice response system. For more information about these two types of voice entities, see "Configuring VoFR" and "Configuring customizable IVR."