tbct command

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tbct command

The tbct command administers the Two B-Channel Transfer feature.

Synopsis

`tbct assign`	`numchan=number of reserved B Channels for outgoing calls`
	`[transfer=alerting\|answer]`
	`[fail=bridge\|disconnect]`
	`[hunt=ascend\|descend]`
	`[maxrings=1-20]`
	`card=card #`
	`trunk1=y\|n trunk2=y\|n trunk3=y\|n trunk4=y\|n`

`tbct change`	`[numchan=number of reserved B Channels for outgoing calls]`
	`[transfer=alerting\|answer]`
	`[fail=bridge\|disconnect]`
	`[hunt=ascend\|descend]`
	`[maxrings=1-20]`
	`card=card #`
	`[trunk1=y\|n] [trunk2=y\|n] trunk3=y\|n trunk4=y\|n`

`tbct display`	`card=card #`

`tbct unassign`	`card=card #`

Description

The tbct assign command creates a configuration file at /vs/data named tbct.cfg.

The system-wide parameters numchan, transfer, fail, hunt, and maxrings must be assigned before any card parameters may be assigned. The tbct assign command exits with a usage error if an assignment of the system parameters is attempted a second time, that is if tbct already has a configuration file. The tbct assign command exits with a usage error if an assignment of parameters for a particular card is attempted a second time.

Card parameters can only be assigned for NMS cards that are assigned to the ISDN PRI T1 protocol isdntype of nortel or national. If an assignment is attempted for a card that is not assigned to the ISDN PRI T1 protocol with isdntype of nortel or national, the command exits with a usage error.

The tbct change command, with a card parameter, changes configuration file parameters for TBCT for that card. If the configuration file does not exist or the card is not already defined in the configuration file, the change command exits with a usage error.

The tbct display command, with a card parameter, displays the TBCT parameters for that card.

The tbct unassign command deletes the configuration file and the backup configuration file, if any.

Note:
The backup configuration file that adds .bak to the configuration file name is created if one or more tbct change commands are executed after tbct assign.

When Two B-Channel Transfer is administered for the first time, a configuration file is created in the /vs/data directory. The configuration file is used by maintenance software when the voice system is initialized so that Two B-Channel Transfer (tbct) can be configured using the parameters defined in the configuration file.

You can use the tbct assign or tbct change commands to administer the parameters. The following table lists the possible values for each parameter:

Argument	Description	Comments
card	A number that identifies a telephony card	Options include valid NMS card numbers
trunk1	Whether or not trunk1 for card x (x is the card number) allows the TBCT feature
trunk2	Whether or not trunk2 for card x (x is the card number) allows the TBCT feature
trunk3 (quad cards only)	Whether or not trunk3 for card x (x is the card number) allows the TBCT feature
trunk4 (quad cards only)	Whether or not trunk4 for card x (x is the card number) allows the TBCT feature
numchan	Number of B-channels to reserve for outgoing calls	You can reserve 0 through the number of b-channels (0-190)
transfer	When to invoke the B-channel transfer	Options include alerting and answer. Default is answer.
fail	Error handling method to invoke if the B-channel transfer fails	Options include bridge and disconnect. Default is bridge.
hunt	Channel hunt method	Options include ascend and descend. Default is ascend.
maxrings	Number of rings to allow after placing an outgoing call	Options include 1 to 20.