Cisco Champions 2017

The first time that I heard about the Cisco Champions program, it was back late in November 2015. At that time, I saw the form to submit his application but probably with...
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Migration to collaboration.ksiazek.be

Hello, As announced last week, I'm in the process of the migration of my old blog http://ccievoice.ksiazek.be to the new portal here ( https://collaboration.ksiazek.be)....
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SparkBoard Announcements #LeaveYourMark

Yesterday , it was a Cisco Live Broadcast Event where Rowan has introduced the new product SparkBoard and this is completing the Spark product with whiteboard and still...
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New Things are coming on 🙂

Ok back on trail in 2017 , I really need to revamp my blog 🙂 . This is why I will try to jump again on the blog and begin to publish more things in regards with the...
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Protecting Voice Media and Signaling Traffic

There is two types of security that you can enable with Call Manager Mixed mode : In this mode, depending the security configured on each phone, you can have secure calls when both devices are...

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Managing Certificates in an IPT network

Typically , in a PKI, there is a singme Certificate Authority (CA) or hierarchy of CA to issue certificates. However, several other elements can play this role too: Self-signed certificates : These...

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IPT Authentication and Encryption

All IPT devices as Call Manager, IP phones and voice gatewats can be configured to authenticate and encrypt voice signaling and media traffic. Phones can also be configured to authenticate phone...

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MCS OS Hardening

Call Manager 4.X runs on a Windows 2000 platform and this is important to ensure that the MCS OS is properly hardened so that it can’t be attacked and compromised. One of the first things to...

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DHCP Snooping

IP Phones as PC can use the DHCP to retrieve an IP configuration(IP Address, netmask, default gateway, DNS, TFTP, …). therefore, if an attacker is able to interfere with DHCP, he might be able...

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