CCNA Voice Summary – Part 8

 CUCM (Cisco Unified Communication Manager / Call Manager) Fully featured Voice and Video. Supports up to 30000 IP phones per cluster in reality around 20000. A cluster is a shared database. Multi-server redundancy. Multi-site support. Very expensive compared to the rest. It runs on a hardened red hat Enterprise Linux platform as an appliance with … Continue reading CCNA Voice Summary – Part 8

CCNA Voice Summary – Part 4

Circuit Switched Network Involves 2 nodes that establish a dedicated circuit in order to communicate. The channel remains up during the whole conversation. PSTN is the largest Circuit switched network in the world. The PSTN uses SS7 signaling. Advantages: Dedicated Channel; Excellent quality; delay and bit rate is constant Disadvantages: Not always enough available channels; … Continue reading CCNA Voice Summary – Part 4

CCNA Voice Summary – Part 3

Digital Connectivity Problems with Analog connectivity: Distance limitation – regeneration of the signal also leads to regeneration of the white noise Wiring requirements – Analog requires a tip and ring wire for each call – that makes it 2 wires for each call. These problems are overcome by digital signals. Digital signals converts the signals … Continue reading CCNA Voice Summary – Part 3

CCNA Voice Summary – Part 2

Analog Connectivity Analog transmission – using some property of the transmission media to convey a signal. As you speak into an analog phone, the voice is converted into electricity. Analog transmission uses the properties of electricity to transmit signals.  Analog signaling: Loop start. The phone has 2 connections – tip and ring. When the phone … Continue reading CCNA Voice Summary – Part 2

CCNA Voice Summary – Part 1

Introduction to VoIP Why Use VOIP Cost Savings: reduced wiring - one single cable for both phone and computer; reduced telecommuter costs since they connect to the HQ via internet; Free long distance between branches and HQ; Single inbox for voicemail, fax and email using unity connection; Saves office space using extension mobility; Open architecture … Continue reading CCNA Voice Summary – Part 1

Cisco VoIP: How to configure Basic Telephony on a Brand new Cisco Call Manager Express (CME )

** Enable Telephony Service G00-2921-01#conf t G00-2921-01(config)#telephony-service ** Configure CME source address G00-2921-01(config)#telephony-service G00-2921-01(config-telephony)#ip source-address G00-2921-01(config-telephony)#end ** Configure Max ephones and DNs G00-2921-01#conf t Enter configuration commands, one per line. End with CNTL/Z. G00-2921-01(config)#telephony-service G00-2921-01(config-telephony)#max-ephones 25 PLEASE READ THE FOLLOWING TERMS CAREFULLY. INSTALLING THE LICENSE OR LICENSE KEY PROVIDED FOR ANY CISCO PRODUCT FEATURE … Continue reading Cisco VoIP: How to configure Basic Telephony on a Brand new Cisco Call Manager Express (CME )