Using ISDN call transfer

This section describes how to transfer calls on Blueworx Voice Response using ISDN. Blueworx Voice Response supports four protocols, EuroISDN and E1 QSIG Single Step Transfer Supplementary Service protocols, the ISDN two B-channel transfer protocol, and the Nortel proprietary Release Link Trunk (RLT) call transfer protocol.

The ISDN call transfer application works with the two B-channel transfer and the Nortel RLT protocols, and where there are differences between the two these are noted, otherwise the information in the following section applies to both protocols.

The ISDN single step call transfer works in a different way, and uses a different custom server to that used by the other ISDN call transfer protocols. It also uses different state tables.

This section is laid out as follows: