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Command Reference Guide

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174 ● isdn bch-local-manage 3Com Router 5000 Family and Router 6000 Family
Command Reference
isdn bch-local-manage
Purpose Use the isdn bch-local-manage command to enable local ISDN B channel
management.
Use the undo isdn bch-local-manage command to disable the setting.
Syntax isdn bch-local-manage [ exclusive ]
undo isdn bch-local-manage
Parameters exclusive
Exclusive local management mode for ISDN B
channels. When the B channel indicated by the
exchange is inconsistent with the one required by the
local end, call failure occurs.
Example Enable local ISDN B channel management.
[3Com-Bri2/0/0] isdn bch-local-manage
View This command can be used in the following views:
■ ISDN Interface view
Description It is very important to put appropriate control on the B channels used for calls in
process, especially in the PRI mode. Proper channel management can improve call
efficiency and reduce call loss. Normally, the centralized B channel management
provided by exchanges can work well. For this reason, you are recommended to
adopt the management function provided by exchanges in most cases, despite the
ISDN module can provide the channel management function as well.
Configured with isdn bch-local-manage command, the router operates in
local B-channel management mode to select available B channels for calls. Despite
this, the connected exchange has higher priority in B channel selection. If the B
channel the router selected for a call is different from the one indicated by the
exchange, the one indicated by the exchange is used for communication.
Configured with the isdn bch-local-manage exclusive command, the
router operates in exclusive local B-channel management mode. In this mode, the B
channel selected by the router must be adopted for communication. In the Channel
ID information element of the call Setup message sent for a call, the router indicates
that the B channel is mandatory and unchangeable. If the connected exchange
indicates a B channel different from the one selected by the router, call failure occurs.