In EMEA, the public network service providers support the ISDN Call Completion Busy Subscriber (CCBS) capabilities where the service provider allows Automatic Callback for a busy subscriber. By implementing ISDN CCBS Supplementary Services, Communication Manager enables automatic callback to the public network from release 5.0 onwards.
Note:
The CCBS feature is not supported by all service providers. The Call Completion on No Reply (CCNR) feature is defined by the ETSI standards. But the CCNR feature is not supported by Communication Manager, or by service providers for new customers.
The following settings must be administered to use this feature:
On the ISDN Trunk Group screen, set Supplementary Service Protocol to option c (which is usually already set for ETSI public network trunks).
Also on the ISDN Trunk Group screen, set NCA-TSC Trunk Member to the trunk member whose D-channel will be used to route the ETSI CCBS request.
To enable ETSI for BRI, you must set the Interface column to user or network to enable option c (stated in step 1) in the TSC SS Protocol column on the BRI-Trunk-Board screen. Also, the maximum number for the NCA-TSC field has to be a value > 0.
For PRI, you must set the TSC Supplementary Service Protocol field on the Signaling Group screen to c to enable ETSI. Also, the maximum number of NCA-TSC field on the Signaling Group screen has to be set to a value > 0.
For more information, see Avaya Aura® Communication Manager Screen Reference.
