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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.