Limitations of ISDN single step call transfer

There are some limitations associated with using ISDN single step call transfer with Blueworx Voice Response. These limitations are:

• The two calls involved in the transfer (the original inbound call and the outbound call to the third party) must be connected to Blueworx Voice Response from the same switch. The specifications allow the two calls to be on different trunks, provided that both trunks support ISDN single step call transfer.

  If the Blueworx Voice Response system has a mixture of CAS, SS7, and ISDN trunks, the user application should ensure that the outbound call is made on the correct trunk for a ISDN single step call transfer to be successful.

• No user access is given to the information elements on the transfer.
• ISDN single step call transfer is not totally compatible with the Blueworx Voice Response signaling model, so application changes will be required when porting applications that involve transfer operations from different telephony configurations.