VOIP 1c

Session Initiation Protocol (SIP)

A VoIP signaling protocol used to set up, maintain, and terminate VoIP calls. (Layer 4)

Skinny Client Control Protocol

Cisco-proprietary voice-signaling protocol used to control Cisco IP phones.

What is an IP network?

Computer network that ultilizes TCP/IP protocol suite to deliver data from one comp. to another via packets.

Voice Gateway

Connects VoIP and PSTN devices

What OSI level do VLANS operate on?

Data-link layer (2)

What is H.323 protocol?

Defines the functions, messages, message formats req. for call est., termination, tracking, IP phone config, sampling, and voicemail and caller ID

Codec

Device/computer program, encodes/decodes data stream, or compresses/decompresses medial files

What are the five VoIP components?

Endpoint devices, Call processing server, Voice gateways, VoIP protocols, and IP network

Other terms used with VoIP?

IP telephony, Internet telephony, Voice over Broadband, Broadband telephony

What layer does the VoIP transport protocol operate at?

Layer 7 - Application layer

Differentiated Services Code Point (DSCP)

Means of classifying and managing network traffic and of providing QoS in modern layer 3 IP networks. Uses 6-bit differentiated Services field in the IP header for packet classification

What are clusters made up of and their purpose?

Multiple call processing servers connected via SIP trunks to load balance VoIP traffic and provide redundancy

Real-Time Transport Protocol (RTP)

Non proprietary, responsible for managing the transmission of voice data once call is est.

Orgs. Measure QoS using what parameters? (5)

Packet loss (gaps in speech), Packet Jitter (result of network congestion), packet latency (echo & overlapping audio), Bandwidth (net capacity), Mean opinion Score (numerical score from users)

2 key services network switches provide

Power over Internet, Virtual VLAN support

What is the primary standard for transmitting audio over IP network?

RTP

Two types of Secure VoIP implementations

SVoIP (encrypt the phone), VoSIP(encrypt the network)

What is a protocol?

Standard or set of rules that computer network devices follow when transmitting and receiving data.

What is a call processing server?

Stores end device IDs, directory numbers, config settings and est. calls

Signaling protocols vs. Transport Protocols

Where VoIP components comm. w/ each other to prepare for a call vs. data formatting, identifying the CODEC, and carrying the voice traffic.