Appendix A - Glossary
A-5
T207S, T208S, T207S/NP and T208S/BL User Guide
TLS
Transport Layer Security. A transport protocol for delivering data over an IP
network. TLS is a secure transport protocol, which means that all the data being
transmitted (signaling and media) is encrypted. Other transport protocols are
“TCP”
and
“UDP”
.
Time-Out
A predetermined period of time allowed to complete a specific function. If the
function is not completed, for example dialing, the caller is dropped. See also
“Recall-Automatic”
.
Trunk
An outside line from the telephone company that terminates at the customer’s
location.
Trunk Group
A number of trunks linked together (members) for a common outgoing function.
Trunk Number (Coral)
The access code number that is dialed by station users to gain access to a specific
outside line.
Trunk Number, CO
Usually referred to as CO Trunk Number. This is the number dialed by an
outside telephone user from the public network (through the Central Office) in
order to call an internal station. (Number listed in the local telephone directory.)
UDP
User Datagram Protocol. A transport protocol for delivering data over an IP
network. Other transport protocols are
“TCP”
and
“TLS”
.
URI
Uniform Resource Identifier. A name or address that identifies a location on the
world wide web. A SIP address is a type of URI.
