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