Intel 05-2409-003 5.3 Using Global Call with Digital Network Interface Boards

Global Call API for HMP on Windows Programming Guide — August 2006 79

Application Development Guidelines

connected so as to provide the calling party with immediate outbound line status and voice cut-

through.

For a drop and insert application in which a call cannot be completed, the application can simulate

and return a busy tone or a fast busy (redial) tone to the calling party. Typically, this condition

occurs when a GCEV_DISCONNECTED event is generated due to a timeout or a protocol error

during dialing or due to R2 backward signaling indicating a busy called party’s line, equipment

failure, network congestion or an invalid telephone number.

When a call cannot be completed because the called party’s line is busy:

1. Use a tone or voice resource to generate a busy tone (60 ipm [impulses per minute]) or to

record a busy tone.

2. Connect the busy tone to the calling party’s line or play back the recorded busy tone file.

3. Drop and release the calling party’s line when a GCEV_DISCONNECTED event is received.

When a call cannot be completed because of equipment failure, network congestion or an invalid

telephone number:

1. Use a tone or voice resource to generate a fast busy tone (120 ipm) or to record a fast busy

tone.

2. Connect the fast busy tone to the calling party’s line or play back the recorded fast busy tone

file.

3. Drop and release the calling party’s line when a GCEV_DISCONNECTED event is received.

For voice function information, see the Voice API Library Reference for your operating system.

5.3 Using Global Call with Digital Network Interface Boards

The HMP software can be used in conjunction with Intel NetStructure® Digital Network Interface

boards that provide physical E1 and T1 interfaces. These Digital Network Interface boards are

based on the DM3 architecture. Global Call supports the development of applications that use these

boards. The following topics provide guidelines for using Global Call with Digital Network

Interface boards:

•Routing Overview

•Working with Flexible Routing Configurations

•Handling Multiple Call Objects Per Channel in a Glare Condition

The HMP software supports flexible routing configurations. With flexible routing, the resource

devices (voice/fax/media) and network interface devices are independent, which allows exporting

and sharing of the resources.