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

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Presentation transcript:

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 Many areas to examine, let’s discuss the following – Zoning – Normalization – Traffic Engineering – High Availability

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

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

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

References Durkin, James F. Voice-Enabling the Data Network. Cisco Press: Indianapolis, IN ISBN: