CCNA Voice Summary – Part 12

Administrative User Interfaces for Unified Communicatin Products - CUCM, Unity Connection, CUPS, CUCX. Unified OS Administration - for software management upgrades, tftp management; time, security - IPSEC tunnels, certificate management; interface specifics etc. All SIP phones get their times from the NTP and the SCCP from CUCM. Unified Servicability - check which network services are … Continue reading CCNA Voice Summary – Part 12

CCNA Voice Summary – Part 10

 Cisco unified Presence server CUPS It is a presence add-on to CUCM. It provides status information and enterprise instant messaging. Integration with CUPC -Cisco Unified Personal Communicator, IP Phone Massager IPPM (IM on a phone), Instant Messaging IM, 3rd party presence integration through SOAP and AXL. Uses standard SIP to collect data. It integrates into … Continue reading CCNA Voice Summary – Part 10

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