Tag Archives: voip

Calling Party Routing of Anonymous Calls SIP Header Fix Up

Cisco’s “Route Next Hop By Calling Party Number” translation pattern option has addressed the common question of “how do I route or block calls based on Caller ID?” since CUCM version 8. However, there still remains a limitation and that is how to deal with “Anonymous”, “Restricted” or “Unknown” Calling Numbers. The problem is that the SIP information actually lists this as part of the From header where CUCM typically would expect to see a numeric value. Continue reading

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Cisco Mobile and Remote Access QR Code

If you have checked out the Cisco Spark Calling offering you may be familiar with the QR Code that is generated that can be used to register 8845 and 8865 phones to Spark. You simply hold the QR code in front of the phone and it’s read in and the phone registers. The Spark Calling QR code is a 16 digit number unique to Spark with a limited validity period for security. As an engineer I had wondered to myself why this functionality cannot be available with CUCM deployments as well. After all the phones run the same software… As … Continue reading

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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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