Summarizing Examples of Voice Port Applications
Table 3-1 lists application examples for each type of call.
Table 3-1 Voice Port Call Types
Type of Call Example
Local call One staff member calls another staff member at the same office. The
call is switched between two ports on the same voice-enabled router.
On-net call One staff member calls another staff member at a remote office. The
call is sent from the local voice-enabled router, across the IP network,
and is terminated on the remote office voice-enabled router.
Off-net call A staff member calls a client who is located in the same city. The call
is sent from the local voice-enabled router, which acts as a gateway, to
the PSTN. The call is then sent to the PSTN for call termination.
PLAR call A client picks up a customer service telephone located in the lobby of
an office and is automatically connected to a customer service representative
without dialing any digits. The call is automatically dialed
based on the PLAR configuration of the voice port. In this case, as
soon as the handset goes off hook, the voice-enabled router generates
the prespecified digits to place the call.
PBX-to-PBX call One staff member calls another staff member at a remote office. The
call is sent from the local PBX, through a voice-enabled router, across
the IP network, through the remote voice-enabled router, and terminated
on the remote office PBX.
Intercluster trunk call One staff member calls another staff member at a remote office using
IP phones. The call setup is handled by a Cisco Unified
Communications Manager server at each location. After the call is set
up, the IP phones generate IP packets carrying voice between sites.
On-net to off-net call One staff member calls another staff member at a remote office while
the IP network is congested. When the originating voice-enabled
router determines that it cannot complete the call across the IP network,
it sends the call to the PSTN with the appropriate dialed digits
to terminate the call at the remote office via the PSTN network.