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

The Road to CCNP Voice

So it's been a while I'll admit. Things have changed I have a new job with more focus VoIP / UC. In fact it's my task to cut over multiple CUCM clusters to 8.6 and along the way ditch Cisco Unity in favor of Microsoft Exchange 2010 UM.

So during this journey I plan to make some postings of useful tips I run across and also while I study for CCNP Voice I will use the blog to help myself retain some information.

That being said. PowerShell is pretty cool, never thought I'd say that but I've run across some useful commands to help me extract data from the AD side of the house to compare against Unity.

If you're in our boat you have Lync but your AD forest is still old. That being said PowerShell against AD is then off limits. Unless you cheat and use Lync to get the information for you.

Export list of Users from Lync

Import-Module Lync
Get-CsAdUser -OU "ou=Users,ou=Location,dc=blah,dc=domain,dc=com" | Select-Object SamAccountName,FirstName,LastName,Phone | Out-File C:\Users\person\Desktop\users.txt

What that lovely  command above will do is, extract all the users from the OU in a nice Tab separated file on the desktop with the following fields: Account Name, First Name, Last Name, Primary Phone Number.

Stay tuned for more details as I lose my mind during the migration and cram some CCNP Voice knowledge in. First up is the CVoice book.

CCNA Voice Passed

So I finally finished up my CCNA voice. In hind site I could of had this done months ago. I will say I was disappointed only one simulation and a lot of arbitrary questions.