Version 5.8  485  September 2009 
SIP User's Manual   13. Glossary 
 
Term  Meaning 
STUN  Simple Traversal of UDP through NATs 
TCP  Transmission Control Protocol 
TCP/IP  Transmission Control Protocol / Internet Protocol 
TFTP  Trivial File Transfer Protocol 
TLS  Transport Layer Security 
TON  Type of Numbering 
UA  SIP User Agent 
UDP  User Datagram Protocol 
URI (SIP URIs)  SIP Uniform Resource Indicators 
VBD Voice-band data 
VLAN  Virtual Local Area Network 
VoIP  Voice over Internet Protocol 
VoP  Voice over Packet(s) 
VPN  Virtual Private Network 
µ-Law  A companding algorithm, used in the digital telecommunication systems