Building a SIP application

To build a SIP application, use the SIP for NCC API and other NaturalAccess APIs. The following illustration shows the tasks a SIP application performs. Shaded tasks are optional.

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The following table summarizes the tasks in the previous illustration:

Task

Application activity

Initialize NaturalAccess

Initializes NaturalAccess services and creates the required number of call control and media contexts.

Initialize connections to the SIP server

Invokes nccStartProtocol to establish a connection between the NCC SIP call control contexts and the SIP server.

Establish call

Uses NCC API functions to place outgoing calls, receive incoming calls, or both.

Establish media connection

Optional. Uses MSPP service functions to establish a media streaming channel.

Perform tasks

Uses functions from NaturalAccess or other APIs to perform tasks such as play or record voice, generate or detect DTMF tones, as well as send and receive faxes.

Disconnect call

Uses NaturalCallControl service functions to disconnect and release the call. The application can then establish another call.

Destroy media connection

Optional. Uses MSPP API functions to destroy the media streaming channel.

Implementing media streaming

When using Fusion software, you must configure the CG boards appropriately. For information about Fusion software, refer to the Dialogic® NaturalAccess™ Fusion™ VoIP API Developer’s Manual.