14
L
OCAL
C
ALL
R
OUTING
This chapter describes the telephone service that the BSGX4e device can provide
without the use of a VoIP call server on the WAN. This service is called local call
routing or LCR mode and is available even during a VoIP service interruption.
VoIP Service Interruption
The BSGX4e device can provide backup phone service even when VoIP phone service
is unavailable. As long as power is available, local call routing can connect internal
calls and place external calls through the FxO port (see Figure 16).
A VoIP service interruption can occur if the WAN connection fails, the call server
connection fails, or a call server is not available. However, it is not considered a
service interruption when a VoIP call cannot be placed due to lack of bandwidth.
Figure 16. VoIP Service Interruption
No VoIP
Service
Analog Access
through an
FXS Port
Local Call Routing
by the LAN Switch
VoIP
Phones
PSTN
External Calls
through an FXO
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