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VoIP – Gateway/Gatekeeper Design Requirements

VoIP – Gateway/Gatekeeper Design Requirements. An Examination Ricardo Estevez CS 522 / Computer Communication Fall 2003. Big Picture. Precise Picture. Gateway and Gatekeeper Signaling. Gatekeeper and Directory Gatekeeper Signaling. Gateway/Gatekeeper Design Requirements.

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VoIP – Gateway/Gatekeeper Design Requirements

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  1. VoIP – Gateway/Gatekeeper Design Requirements An Examination Ricardo Estevez CS 522 / Computer Communication Fall 2003

  2. Big Picture

  3. Precise Picture

  4. Gateway and Gatekeeper Signaling

  5. Gatekeeper and Directory Gatekeeper Signaling

  6. Gateway/Gatekeeper Design Requirements • Many areas to examine, let’s discuss the following • Zoning • Normalization • Traffic Engineering • High Availability

  7. Gateway/Gatekeeper Design Requirements • Zoning • NPA-NXX • Numbering Plan Area NPA - Prefix • Several gateways form a zone • 1 or more zones can register with a single gatekeeper • Gatekeeper will choose zone based on prefix lookup • Gatekeeper will choose terminating gateway based on priority

  8. Gateway/Gatekeeper Design Requirements • Normalization • Use Directory Gatekeepers (DGK) for global routing • Use Gatekeeper for local routing • Traffic Engineering • Grade of service • Traffic load • Trunk size

  9. Gateway/Gatekeeper Design Requirements • High Availability • Gateway declares its degree of availability via a Resource Availability Indicator (RAI) • RAI thresholds are set • A gatekeeper will favor a gateway for call handling RAI threshold is not exceeded • Increases call completions • Alternate Gatekeeper and DGK

  10. References Durkin, James F. Voice-Enabling the Data Network. Cisco Press: Indianapolis, IN. 2003. ISBN: 1-58705-014-5

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