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:

• When can I use ISDN Two B-channel transfer?
• When can I use ISDN RLT call transfer?
• When can I use ISDN single step call transfer?
• What the ISDN call transfer application does
  • Limitations of ISDN call transfer
  • Installing the application
  • Configuring the ISDN_Call_Transfer custom server
  • How to use ISDN call transfer
  • Custom server functions
  • State table definitions
• What the ISDN single step call transfer application does
  • Limitations of ISDN single step call transfer
  • Installing the application
  • Configuring the SSTransfer custom server
  • How to use ISDN single step call transfer
  • Custom server functions
  • State table definitions