CCNP Voice Notes - Call Processing / Deployment Models

Call Processing Agents

Agent	Recommended Size	Comments
Cisco CME	Up to 240 Phones	Dependent on Cisco IOS Platform
CUCM	50 – 30,000 Phones
Legacy PBX	Dependent on PBX

IPT Deployment Models

·         Single Site

o   Design Characteristics

§  30k SCCP / SIP phones per cluster

§  2,100 H.323 / MGCP gateways per cluster

§  DSP resources for transcoding / MTP as needed

o   Benefits

§  Ease of deployment

§  Common infrastructure for a converged solution

§  Simplified dial plan

§  No transcoding resources needed because of the use of a single high band-width codec.

·         Multi-site with centralized call processing

o   Design Characteristics

§  All single site Characteristics

§  Max 1000 locations per CUCM cluster

§  Max 150ms one-way latency to phones

o   Benefits

§  Single point of management

§  Cost savings using IP WAN for calls between sites

·         Multi-site with distributed call processing

o   Design Characteristics

§  All single site Characteristics

§  Max 1000 locations per CUCM cluster

§  Max 150ms one-way latency to phones

o   Benefits

§  Cost savings using IP WAN for calls between sites

§  Use of IP WAN for TEHO

§  No loss of functionality during WAN outage

·         CoW – Cluster over WAN

o   Design Characteristics

§  All single site Characteristics

§  Max 1000 locations per CUCM cluster

§  Max 150ms one-way latency to phones

§  Max 40ms one-way latency between cluster nodes

o   Benefits

§  Single point of Administration

§  Feature transparency

§  Extension mobility within cluster

§  Unified dial plan