
200 Glossary
P0604630 03
silence compression/silence suppression
This is the utility that omits the data packets that occur when no one is talking during the
IP trunk calls, thus reducing the bandwidth load required for IP calls.
Symbol NetVision handsets
These IP telephones connect to the system through wireless access points connected to the
same network to which the Business Communication Manager is connected.
T.38 fax
Refer to VoIP Fax.
target lines
These are internal channels on the Business Communications Manager that allow you to
direct incoming calls to specific telephones, call groups/Hunt groups, or system devices.
System telephones require target lines (if they have not already been configured) when
receiving VoIP trunk calls, so the call knows where to go.
terminal
Device capable of sending or receiving data over a data communications channel.
throughput
Indicator of data handling ability. Measures data processed as output by a computer,
communications device, link, or system.
topology
Logical or physical arrangement of nodes or stations.
Traceroute
Traceroute uses the IP TTL (time-to-live) field to determine router hops to a specific IP
address.
UNISTIM Terminal Proxy Server (UTPS)
This is a Nortel-designed protocol for IP telephony applications. The i2004 and i2002, for
instance, use this protocol to communicate with the Business Communications Manager.
voice compression
Method of reducing bandwidth by reducing the number of bits required to transmit voice.
Voice over IP (VoIP) trunks
VoIP trunks are virtual telephone lines that the Business Communications Manager uses
instead of wired lines to transfer IP traffic to other compatible systems with VoIP trunks.
Both digital and IP telephones can use these channels. The Business Communications
Manager supports trunks using the H.323 and SIP protocols.
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