Setting the local management ISDN B channel
Configured with the 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.
To set the local management ISDN B channel:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter interface view. | interface interface-type interface-number | N/A |
3. Set the local management ISDN B channel. | isdn bch-local-manage [ exclusive ] | Local ISDN B channel management is not configured and the remote end is responsible for B channel management by default. Exclusive local management mode for ISDN B channels is applied to the network side for the device. If the device serves as the user side connected with ISDN switch, and the B channel indicated by the exchange is inconsistent with the one required by the local end, call failure occurs. |