The SSTransfer custom server generates the ASN1 encoding data for the facility message. Your application invokes the ssct_transfer state table to create a facility message and send it to the network, which then connects the existing incoming call with a new party.
The process does not involve using the ISDN_Call_Transfer custom server. For more information, refer to the supplied ssct_tag example state table, which demonstrates how to use the ssct_transfer state table.
The TIncoming_Call state table is used in place of the default Incoming_Call state table. It is exactly the same as the Incoming_Call state table but saves call data to a global variable before answering the call. The saved call data is used to extract the calling party number when transfer is requested. The ssct example state table demonstrates how to use SSTransfer custom server alternative function call. Use this when the calling number is available to your application.