Configure PLAR on SCCP and SIP Phones in CUCM

PLAR is a common feature often used for elevator or emergency phones in public areas. The idea is that when someone takes the phone off hook a call is immediately placed to someone who can help. It’s a critical configuration to get right and test before giving any stamp of approval. Continue reading

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Dial-Peer Destination Balancing

Traditionally, VOIP dial peers follow a fairly limited creation process. You can match a single pattern and direct to a single destination…

…In IOS XE 3.11S and IOS 15.4(1)T a new concept of server groups was created. Continue reading

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Configure Cisco IOS 802.1x Supplicant

If you have an intermediate familiarity with Ethernet switching you are more than likely familiar with 802.1x port based authentication. With that assumption let’s assume your environment is locked down tight enough to the point where this security is enabled. Great! However, what if you needed to add another Cisco device to a client facing switch port? Not so great… How do you get the device to authenticate the same way as your PC does? Fortunately the IOS includes a supplicant for 802.1x that will allow us to authenticate just like a wired windows client! Let’s check out the config … Continue reading

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CUCM Partitions and Calling Search Space Basics

To understand the Class of Control mechanisms in Cisco’s Unified Communications Manager it’s vital that you understand Partitions and Calling Search Spaces. There are a number of analogies that can be drawn to illustrate the concept. I personally have found the analogies more complicated than just a simple explanation. Continue reading

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