Quick Configuration Guide (QCG)
[Two B-Channel Transfer]
Overview
Two B-Channel Transfer (TBCT) enables a PBX connected to a PRI interface to connect two independent calls
together. Once the Adtran accepts the request, the PBX is released from the call and the two call legs are
transferred on the SIP trunk using the REFER method. TBCT is the National ISDN (NI-2) variant of ISDN Explicit
Call Transfer Supplementary Service.
The feature is configured on the PRI interface and is intended only for SIP to PRI and PRI to SIP calls. It is not
supported when one or both calls are connected via analog FXS, analog FXO, or a T1-CAS trunk.
To achieve similar functionality for DMS and ETSI, Release Link Trunk (RLT) and Explicit Call Transfer (ECT)
must be configured respectively. ETSI is only supported in the NV 6310/6330.
This feature was added in A2.05.00
Supported Platforms
TA 900/900e series IPBGs
NV 6000 series IPBGs
Command Line Interface Configuration
Switch Type: NI-2 and 5ESS
TBCT as defined by GR-2865-CORE
Command: [no] isdn supplementary-service tbct
Help: Enable/Disable NI-2 Two B-Channel Transfer
Default: no supplementary-service tbct
Command: [no] isdn supplementary-service tbct notify-controller
Help: Enable/Disable NI-2 TBCT Notification to Controller
Default: no supplementary-service tbct notify-controlle
Command: [no] isdn supplementary-service tbct transfer-counters
Help: Enable/Disable the usage of transfer counters during TBCT
Default: supplementary-service tbct transfer-counters
Note: This command is required for the Nortel interpretation of the NI-2 specification
Command: isdn supplementary-service tbct active-transfers <0-60000>
Help: Set the number of simultaneous transfers
Default: supplementary-service tbct active-transfers 100
Note: Only has an effect if “transfer-counters” is enabled.
Command: isdn supplementary-service tbct transfer-rate <0-500>
Help: Set the number of transfers allowed within a 10 second interval
Default: supplementary-service tbct transfer-rate 10
Note: Only has an effect if “transfer-counters” is enabled.
Command: [no] isdn supplementary-service tbct d-channel-id (auto | <0 – 0xFFFFFFFF>)
Help: Set the d-channel-id for TBCT across multiple interfaces
Default: supplementary-service tbct d-channel-id auto
Note: The “no” command sets to auto.
Switch Type: DMS
RLT as defined
Command: [no] isdn supplementary-service rlt
Help: Enable/Disable DMS Release Link Trunk
Default: no supplementary-service rlt
Switch Type: ETSI
ECT as defined by ETS-300-369
Command: [no] isdn supplementary-service ect
Help: Enable/Disable ETSI Explicit Call Transfer
Default: no supplementary-service ect
Example Configuration
(config-pri 1)#isdn supplementary-service tbct
(config-pri 1)#isdn supplementary-service tbct notify-controller
