User Guide
User Guide
10-62
Appendix A
Glossary
The Glossary defines acronyms, keywords and definitions used in this user guide.
A1
Acronyms
VOIP ATA
Analog Telephony Adaptor
FXO
Foreign Exchange Office
FXS
Foreign Exchange Subscriber
PSTN
Public Switched Telephone Network
PTM
Packet Telephony Module
RTP
Real-time Transport Protocol
SIP
Session Initiation Protocol
STUN
Simple Transversal of UDP through NAT
UA
User Agent
VoIP
Voice over Internet Protocol
A2
Keywords
Caller
Call Originating End is called the Caller.
Callee
The Call Terminating End is called the Callee.
Transferor
The End transferring the call.
Transferee
The End being transferred.
Transfer Target
The End to whom the transferee is being transferred.
A3
Definitions
CPE
Customer Premises Equipment: This specifies equipment on the customer, or LAN, side.
CRC
Cyclic Redundancy Checking: A method for checking errors in a dVoIP ATA transmission
between two computers. CRC applies a polynomial function (16 or 32-bit) to a block of dVoIP
ATA. The result of that polynomial is appended to the dVoIP ATA transmission. Upon receipt, the
destination computer applies the same polynomial to the block of dVoIP ATA. If the host and
destination computer share the same result, the transmission was successful. Otherwise, the sender is
notified to re-send the dVoIP ATA block.