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 11

Quality of Service Disadvantages of packet switched networks can be solved using QoS. ITU recommendations (G.114 specifications): Delay < or = 150 ms one way Jitter < or = 30 ms Packet loss < or = 1% Bandwidth for Voice and Video RTP is subject to codec, sampling, L2 and L3 overhead. Bandwidth for signaling … Continue reading CCNA Voice Summary – Part 11 →

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 9

Cisco Voicemail Options -Cisco Unity Express, Cisco Unity Connection and Cisco Unity Cisco Unity - Original release. It took very long to set up. Runs on windows and fully integrates into Exchange and Lotus Domino. This is fading away. it is being replaced by unity connection. Its greatest advantage was the fact that it integrates … Continue reading CCNA Voice Summary – Part 9 →

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 7

Cisco CME (Cisco Unified Communication Express/ Call Manager Express) Designed for enterprise branch offices and small medium businesses. It runs on a router. Supports a max of 450 IP phones but realistically 100 phones. You can get voicemail using Unity Express (CUE) AIM card and the Network Module NM card. AIM - flash memory and … Continue reading CCNA Voice Summary – Part 7 →

CCNA Voice Summary – Part 6

Cisco UC Components: Unified Call Control –CUCME or CME or UCME, CUCM or UCM or CCM Unified Messaging – Unity Connection OR CUC or CUCx and Unity Express or CUE Unified Presence – CUCM and CUPS (Cisco Unified Presence Server) Unity is window based platform while Unity connection is Linux based. Introduction to CUCM and … Continue reading CCNA Voice Summary – Part 6 →

CCNA Voice Summary – Part 5

; Voice over IP VOIP process: Sample analog Voice or Video ->; Encode to digital value ->; transmission in an IP data payload Uses Signaling Protocol for setup and control of the call and a Media Protocol for the payload. They are transmitted separately. Signaling is typically sent using TCP (connection oriented) because it is … Continue reading CCNA Voice Summary – Part 5 →

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 →