H3C Technologies H3C MSR 50 User Manual

Page 736

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351

Item Description

ISDN Timeslot Management

Configure local ISDN B channel management.

Disable—Local ISDN B channel management is disabled and is in the

charge of ISDN switch.

Common management—The device operates in local B channel

management mode to select available B channels for calls. However, the
ISDN switch still has a higher priority in B channel selection. If a locally

selected B channel is different from that selected by the ISDN switch, the

one indicated by the ISDN switch is used for communication.

Forced management—The device operates in forced local B channel

management mode. In this mode, the device indicates in the Channel ID

information element of a call Setup message that the local B channel is
mandatory and unchangeable. If the ISDN switch indicates a B channel

different from the local one, the call fails.

By default, the local ISDN B channel management is not enabled but is in the

charge of ISDN switch.
It is very important to put appropriate control on the B channels used for calls
in process, especially in PRI mode. Proper channel management can improve

call efficiency and reduce call loss. Generally, 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 that the ISDN module can provide the channel

management function as well.

ISDN Timeslot Order

Set a B channel selection method:

Ascending order—Select B channels in ascending order.

Descending order—Select B channels in descending order.

When operating in B channel local management mode, the device selects B
channels in ascending order by default.
When the exchange manages B channel, these options take no effect. If you

select the Disable option in the ISDN Timeslot Management area, these
options take no effect.

ISDN Overlap-Sending

Enable—Set the ISDN interface to send the called number in overlap

mode. In this mode, the digits of each called number are sent separately

and the maximum number of the digits sent each time can be set.

Disable—Set the ISDN interface to send the called number in full-sending

mode. In this mode, all the digits of each called number are collected and

sent at a time.

By default, the ISDN interface sends the called number in full-sending mode.

Max Number of Digits that
Can Be sent Each Time

Progress-to-Alerting
Conversion

Enable—Enable the ISDN interface to convert received Progress messages
into Alerting messages.

Disable—Disable the progress-to-alerting conversion function.

This option just takes effects on messages received on an ISDN interface.

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