Centralized voice mail with Interswitch Mode Codes does not interwork with SBS trunks. For that application, the tie trunks between the servers that run Communication Manager cannot use the QSIG protocol. While those tie trunks might be used for SBS bearer calls, SBS is likely not implemented when this methodology is used.

Leave Word Calling with Message Wait Indicator over QSIG (QSIG LWC MSI) uses SBS to support Digital Line Emulation integration for centralized voice mail.

SBS supports centralized Communication Manager Messaging from a served user switch.

Where an Octel Serenade is connected to Communication Manager with QSIG, the server that runs Communication Manager is the SBS terminating node. This SBS terminating node interworks to the Serenade, since the Serenade does not support SBS.