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

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Presentation on theme: "VoIP – Gateway/Gatekeeper Design Requirements An Examination Ricardo Estevez CS 522 / Computer Communication Fall 2003."— Presentation transcript:

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 ISBN:


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