Cisco Routers and Dynamic DNS
This short post demonstrates using ‘ip sla’ and freedns.afraid.org for dynamic dns. If you are not familiar with FreeDNS, it is simply a free / shared dns host. Individuals voluntarily host their...
View ArticleHow to add a custom background image in CUCM
Adding a custom background image to a Cisco IP Phone can be tricky. You can use Cisco Phone Designer or you can use the following instructions to upload backgrounds to the dedicated servers so the...
View ArticleCisco IOS – How to configure remote access vpn on a router
As network engineers, many of us spend lots of time on the road. On nights not spent working on the install, a quiet hotel room can be a great place to study. In a previous post, you learned how to...
View ArticleVoice Lab – PSTN Simulation LAB in GNS3 – Part 1
This tutorial is a continuation of the virtual voice lab series. Unfortunately, the virtual voice lab has been a “work in progress” much longer than I had hoped it would be when I started it two years...
View ArticleNo Ring Back to PSTN When Placing Inbound Calls through a Cisco H323 Gateway
Occasionally, I have run into the issue when turning up a PRI that ring back is not heard when placing an inbound call. Caller only hears silence until the called party answers. This seems to be more...
View ArticleVoice Lab – PSTN Simulation LAB in GNS3 – Part 2
This tutorial is a continuation of the virtual voice lab series. In this tutorial, you will add a dial-plan to the PSTN router that was added in the first part of the PSTN simulation lab. The...
View ArticleConfig changes with a menu and tcl scripting tutorial
This tutorial will show you how to make config changes with a simple tcl script and invoke the script from an IOS menu. I was recently presented with a scenario where the FXO ports on a customer router...
View ArticleCUCME: Create an MOH audio file in Windows 7 with Audacity
This tutorial will show you how to create or convert an existing audio file and save it in CCITT u-law – 8KHz 8bit Mono format for use in Cisco Unified Call Manager Express (CUCME), Cisco Unified...
View ArticleInstall Cisco IP Communicator on Win7 in VMware
Cisco IP Communicator (CIPC) requires a sound card be installed on a PC in order to install or open. Under normal circumstances, this completely makes sense. However, in other circumstances...
View ArticleMake a Non-Bootable Cisco Unified Communications ISO Image Bootable
As most of you may or may not know, Cisco currently only provides non-bootable Unified Communications ISO images on CCO for download. These ISOs are listed as being provided for “upgrades” and hence...
View ArticleScreen – Built-In MAC / Linux USB to Serial Console App
‘Screen’ is an application built into Linux and Unix based platforms that allows you to manage multiple windows within a single ssh session. However, it can also be used as a terminal for a USB to...
View ArticleCisco – Config Generator and Template Repository
While working at an ISP for two years, I often needed to give technicians a script with a standard config and instructions to change variables. I started with simple text files, then custom php scripts...
View ArticleCisco IOU install on Ubuntu 14.04 64-bit
At this time, IOU is my emulator of choice. It is very light weight, has routing and switching emulators and will be the basis for the new CCIE R&S Lab. That being said, it is a pain to get running...
View ArticleHow to factory default a Cisco device without rebooting.
Redirect a small part of the config to a file in flash and replace the config with the small config snippet. yourname#show run int g0/1 | redirect flash:clean yourname#configure replace flash:clean...
View ArticleCUCM Standard LDAP Custom Filters
Common CUCM LDAP Filter Examples: Example 1 – Account Enabled and ipPhone field populated (& (objectclass=user)(!(objectclass=Computer))(!(UserAccountControl:1.2.840.113556.1.4.803:=2))(ipPhone=*))...
View ArticleCisco CUCM – Universal Device Template TAGs (Variables, Tokens)
List of undocumented tags that can be used in Universal Device Templates (UDT) and Universal Line Templates (ULT) #FirstName# #LastName# #UserID# #Email# #Department# #Manager# #PrimaryExtension#...
View ArticleCisco IOS – How to configure remote access vpn on a router
As network engineers, many of us spend lots of time on the road. On nights not spent working on the install, a quiet hotel room can be a great place to study. In a previous post, you learned how to...
View ArticleVoice Lab – PSTN Simulation LAB in GNS3 – Part 1
This tutorial is a continuation of the virtual voice lab series. Unfortunately, the virtual voice lab has been a “work in progress” much longer than I had hoped it would be when I started it two years...
View ArticleNo Ring Back to PSTN When Placing Inbound Calls through a Cisco H323 Gateway
Occasionally, I have run into the issue when turning up a PRI that ring back is not heard when placing an inbound call. Caller only hears silence until the called party answers. This seems to be more...
View ArticleVoice Lab – PSTN Simulation LAB in GNS3 – Part 2
This tutorial is a continuation of the virtual voice lab series. In this tutorial, you will add a dial-plan to the PSTN router that was added in the first part of the PSTN simulation lab. The...
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