Cisco Collaboration Blog by Dmytro Benda: October 2012

Welcome Message

Welcome to my blog about Cisco Collaboration, voice, and contact center technologies.

I’m Dmytro Benda, a Cisco instructor (CCSI#33268) and collaboration specialist. Here I share practical articles, lab notes, configuration tips, and troubleshooting ideas based on real work with Cisco Unified Communications Manager, Unified CME, gateways, CUBE, and contact center solutions.

This blog is for engineers, students, and anyone working with Cisco collaboration technologies who wants clear technical content and real-world examples. I also post updates about Cisco training, my own courses, and upcoming learning activities.

If you have a question related to a post, a technology covered here, or Cisco training, feel free to get in touch.

Tuesday, October 30, 2012

Examples of the simplest CUCME configuration for beginners

Good morning!

For those who are taking their first steps in the world of VoIP and learning how to configure Call Manager Express (CUCME), I think the following link will be helpful. The document provides examples of the simplest configuration of SCCP and SIP phones for registration on CME:

http://www.i-1.nl/blog/wp-content/uploads/CUCME-cheatsheet-1.0.pdf

As you can see, everything is very simple :)

Sunday, October 28, 2012

About troubleshooting poor voice quality issue when calling from Cisco Jabber clients

Good morning!

A couple of weeks ago, I was troubleshooting a problem with poor voice quality when calling from Cisco Jabber software clients. The customer's VoIP network covered several offices in different cities, CUCM 8.6 and СUP 8.6 were used. In general, there were about 1,500 users in their enterprise telephone network, and more than a thousand of them did not have Cisco hardware phones and called each other using Cisco Jabber.

The problem was that when calling from Cisco Jabber, users complained about poor voice quality, namely, interruption of speech, gaps, etc, while words and phrases were sometimes completely unintelligible. Moreover, the problem was present even when making calls within the LAN! Usually, this phenomenon is associated with network problems - a large percentage of voice packet losses. And the reason for the loss of voice packets could be a high jitter value, incorrectly configured queues on routers, insufficient bandwidth, enabled VAD, and the wrong choice of codec.