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APPENDIX I. Glossary/List of abbreviations

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A

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ADSL – Asymmetric Digital Subscriber Line AOR – Address of Record ATA – Advanced Technology Attachment

B

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B2BUA – Back-to-Back User Agent BLF – Business Lamp Field

C

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CDR – Call Details Record CLI – Calling phone number CLD – Called phone number COMEDIA – Connection-Oriented Media CPE – Customer Premises Equipment CPS – Calls per Second CSCF – Call Service Control Function

D

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DID – Direct Inward Dialing DNS – Domain Name System DoS – Denial of Service DSBC – Dispatching SBC DSL – Digital Subscriber Line DTMF – Dual-Tone Multi-Frequency DTLS – Datagram Transport Layer Security

E

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E911 – Enhanced 911

H

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HLR – Home Location Register HTTP – HyperText Transfer Protocol

I

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ICE – Interactive Connectivity Establishment IM – Instant Messaging IMS – IP Multimedia Subsystem ISDN – Integrated Services Digital Network IVR – Interactive Voice Response

L

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LAN – Local Area Network LCR – Least-Cost Routing

M

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MAC – Media Access Control

N

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NAT – Network Address Translation

P

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PAI – P-Asserted-Identity PCI – P-Charge-Info PDA – Personal Digital Assistant PBX – Private Branch Exchange PPI – P-Preferred-Identity PSAP – Public-Safety Answering Point PSTN – Public Switched Telephone Network

Q

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QR – Quick Response

R

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RPID – Remote-Party-ID RTP – Real-Time Transfer Protocol RTCP – Real-Time Transport Control Protocol

S

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SBC – Session Border Controller SDP – Session Definition / Description Protocol SDES – Session Description Protocol Security Descriptions SIP – Session Initiation Protocol SMPP – Short Message Peer-to-Peer SMS – Short Message Service SRTP – Secure Real-time Transport Protocol SRV – Service Record STUN – Session Traversal Utilities for NAT

T

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TAS – telephony Application Server TCP – transmission Control Protocol TFTP – trivial File Transfer Protocol TLS – transport Layer Security TURN – traversal Using Relay NAT

U

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UA – User Agent UAC – User Agent-Client UAS – User Agent-Server UDP – User Datagram Protocol UPnP – Universal Plug and Play

V

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VoIP – Voice over IP

W

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WAN – Wide Area Network WebRTC – Web Real-Time Communication

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