Dialogic 6.2 manual Setting up the Two-Channel Call Transfer, Connecting Resources, November 191

Making Two-Channel Call Transfers (Tromboning)

Setting up the Two-Channel Call Transfer

In the typical two way call transfer application, the application detects an incoming call and answers the call. The application then performs voice playback and voice recognition functions as needed, responding to the caller's spoken utterances. For example, a caller might speak someone's name and the application then accesses that person's phone number. The application then makes an outbound call on another channel by dialing that person's phone number. When the person answers the call, the application connects the two parties together and monitors both resources to provide additional functionality.

Connecting Resources

To create the two-channel call transfer and perform the required additional functionality, the application must connect various hardware resources. These resources are network timeslots for a T1/E1 phone line or channels. Each resource has an input slot and an output slot. When connecting two resources together, one resource must be defined as the source and the other resource defined as the destination. The application should define the connection type between the two resources as “transmit” because the Brooktrout hardware maintains connections as transmits.

To understand the basic connections that exist between a channel and a network timeslot, see Figure 12. These connections are defined in a Brooktrout configuration file called callctrl.cfg. The connection lines represent both signaling and voice data. When making a two-channel call transfer, the application should modify only the voice data connections.

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