The Need for Signaling and Call Control

Signaling and call control are fundamental to the call establishment, management, and administration of voice communication in an IP network. This section discusses the benefits of using signaling and call control and offers an overview of what signaling and call control services provide.

VoIP Signaling

In the traditional telephony network, a voice call consists of two paths:

  • An audio path carrying the voice

  • A signaling path carrying administrative information such as call setup, teardown messages, call status, and call-progress signals.

ISDN D-channel signaling and Common Channel Signaling System 7 (CCSS7) or Signaling System 7 (SS7) are examples of signaling systems that are used in traditional telephony. ...

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