[cisco-voip] Phone limits per server

[steve.siltman at assurant.com]

I might be able to help with this as I've been working with Cisco on this 
very discussion for weeks. 

I'm using v7.x on 5 Clusters.  I too read that these 7845 servers can 
support 7500 phones per server and 30,000 phones per cluster.  Cisco told 
me that this is true in a perfect world
but Call Center agents use CTI and 500 agents is the max per server with 
2000 agents max per cluster.  I freaked out because thats a 15:1 ratio. 

Another thing Cisco came back with is that if these agents use CVP and 
don't use an IP IVR then that number doubles to 1000 agents per server and 
4000 agents per cluster.

A little better but as Wes said, a massive performance hit.

Here's more info:
http://www.cisco.com/en/US/docs/voice_ip_comm/cust_contact/contact_center/ipcc_enterprise/srnd/75/c7ccmsrv.html#wp1061120

In a deployment with Unified CM 7.0 and Unified CVP (no IP IVR), each 
Unified CM cluster (four primary and four backup subscriber servers) can 
support up to about 4,000 Unified CCE agents. This limit assumes that the 
BHCA call load and all configured devices are spread equally among the 
eight call processing servers with 1:1 redundancy. (See Unified CM 
Redundancy, for redundancy schemes.) Each of the eight Unified CM servers 
(MCS-7845-H2/I2 or later High Performance Servers) would support a maximum 
of 500 agents. In a failover scenario, the primary server would support a 
maximum of 1,000 agents. These capacities can vary, depending on your 
specific deployment. All deployments must be sized by using the Cisco 
Unified CM Capacity Tool or the Unified Communications Sizing Tool.



Date: Wed, 10 Mar 2010 09:47:48 -0500 (EST)
From: Lelio Fulgenzi <lelio at uoguelph.ca>
To: Wes Sisk <wsisk at cisco.com>
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Phone limits per server
Message-ID:
 <1338453699.2032011268232468344.JavaMail.root at simcoe.cs.uoguelph.ca>
Content-Type: text/plain; charset="utf-8"

When you say massive performance hit, what do you mean? Just a rough 
guess. 

Case in point, we have Unity Express boxes, IPCCx boxes. Does each CTI 
port shave the load capacity down by 100 phones or something? 

We also have a Cistera appliance that uses CTI super provider to monitor 
all 8000 phones or so. 


Steve Siltman
Senior Network Engineer - Cisco CCVP


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