Terms and abbreviations

Term or abbreviation

Meaning

3GPP

The 3rd Generation Partnership Project

a-law

Name of G.711 PCMU algorithm

AKA

Authentication and Key Agreement

AMR-NB

Adaptive Multi-Rate Narrowband

AMR-WB

Adaptive Multi-Rate Wideband

AOR

Address-of-record

API

Application Programming Interface

CLIP

Calling Line Identification Presentation

CLIR

Calling Line Identification Restriction

CN

Comfort Noise

CP

Client Provisioning

CRC

Cyclic Redundancy Check

CRLF

Formatting control codes Carriage Return (CR) and Line Feed (LF)

CS call

Circuit-switched call

DM

Device Management

DND

Do Not Disturb

DTMF

Dual-Tone Multifrequency

DTX

Discontinuous Transmission

FEC

Forward Error Correction

FW

Firewall

GSM-EFR

GSM Enhanced Full Rate

GSM-FR

GSM Full Rate

HTTP

Hyper Text Transport Protocol

iLBC

Internet Low Bitrate Codec

IEEE

The Institute of Electrical and Electronics Engineers, Inc.

IETF

The Internet Engineering Task Force

IP

Internet Protocol

IPv4

Internet Protocol version 4

IPv6

Internet Protocol version 6

ITU

International Telecommunication Union

Maxptime

The maximum amount of media (in milliseconds) which can be encapsulated in a payload packet.

MIME

Multipurpose Internet Mail Extensions

MO

Mobile Originated

MT

Mobile Terminated

MWI

Message Waiting Indicator

NAT

Network Address Translation

OMA

Open Mobile Alliance

PCMA

Pulse Code Modulation a-law

PCMU

Pulse Code Modulation µ-law

Ptime

The preferred amount of media (in milliseconds) which is encapsulated in a payload packet. The actual packetisation interval is usually the same as ptime, but can vary depending on the usage of VAD and/or DTX.

PHB

Per-Hop Behaviour

PS call

Packet-switched call

QoS

Quality of Service

RFC

Request For Comments

RTCP

Real-Time Transport Control Protocol

RTCP XR

RTCP Extended Reports

RTP

Real-Time Transport Protocol

SDP

Session Description Protocol

SID

Silence Insertion Descriptor

SIP

Session Initiation Protocol

STUN

Simple Traversal of UDP through NAT; a protocol that allows applications to detect that network address translation (NAT) is being used.

TCP

Transmission Control Protocol

UDP

User Datagram Protocol

UED

Unequal Error Detection

UEP

Unequal Error Protection

UI

User Interface

URI

Uniform Resource Identifier

VAD

Voice Activity Detection

VoIP

Voice over IP

µ-law

Name of G.711 PCMU algorithm