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bearer bandwidth limit (BBL)
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Maximum bandwidth available for voice traffic on an interface when dynamic
call admission control is configured on the interface. See also dynamic
CAC.
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call admission control (CAC)
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Method of limiting voice traffic over a particular link in a network.
See also dynamic CAC.
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centralized automatic message accounting (CAMA)
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Recording of toll calls at a central point.
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direct inward dialing (DID)
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Feature of a trunk line that allows incoming calls to be routed directly
to selected stations without help from an attendant.
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direct outward dialing (DOD)
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Feature of a trunk line that allows outgoing calls to be routed directly
without help from an attendant.
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direct inward and outward dialing (DIOD)
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Feature of a trunk line that allows both incoming and outgoing calls
to be routed directly without help from an attendant. See also direct
inward dialing (DID) and direct outward dialing (DOD).
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Disk-on-Key
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Memory device (stick) that plugs into a USB port to load a complete
JUNOS configuration with VoIP onto a Services Router. You must first use an
Electronic Preinstallation Worksheet (EPW) to download the configuration to
the Disk-on-Key device. The EPW and Disk-on-Key device provide an alternative
method to configure the router for VoIP.
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dynamic CAC
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Application that blocks calls on a WAN interface when the bandwidth
is exhausted. See also call admission control (CAC).
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Electronic Preinstallation Worksheet (EPW)
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Customized Microsoft Excel spreadsheet used with a Disk-on-Key USB memory
stick to configure VoIP on a Services Router. You download the EPW from an
Avaya Web site.
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emergency transfer relay (ETR)
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Feature that provides an emergency link between the telephone connected
to the first LINE port on the TGM550 and the trunk connected to the TRUNK port
on the TGM550 if power is disconnected from the Services Router or if the
TGM550 becomes unregistered from its Media Gateway Controller (MGC).
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IEEE 802.1p standard
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IEEE standard for a Layer 2 frame structure that supports virtual LAN
(VLAN) identification and class-of-service (CoS) traffic classification.
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IEEE 802.3af standard
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IEEE standard that defines a method for powering network devices via
Ethernet cable. Also known as Power over Ethernet (PoE), this standard enables
remote devices (such as VoIP telephones) to operate without a separate, external
power source. See also Power over Ethernet (PoE).
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ITU H.248 standard
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International Telecommunications Union (ITU) standard for communication
between a gateway controller and a media gateway.
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ITU H.323 standard
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International Telecommunications Union (ITU) standard for packet-based
multimedia communications over networks that do not guarantee class of service
(CoS), such as IP networks. H323, modeled after ISDN PRI, is the standard
for voice over IP (VoIP) and conferencing.
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Media Gateway Controller (MGC)
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Avaya media server that controls the parts of the call state that pertain
to connection control for media channels in a media gateway. The MGC is the
controlling entity in an H.248 relationship.
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Power over Ethernet (PoE)
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Electrical current run to networking devices over Ethernet Category
5 or higher data cables. No extra AC power cord or outlets are needed at the
product location.
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public switched telephone network (PSTN)
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The public worldwide voice telephone network.
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standard local survivability (SLS)
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Configurable software feature that enables a TGM550 to provide limited
Media Gateway Controller (MGC) functionality when no link is available to
a registered MGC.
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time-division multiplexing (TDM)
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A form of multiplexing that divides a transmission channel into successive
time slots.
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TGM550
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Avaya Telephony Gateway Module. Avaya VoIP H.248 media gateway module
installed in a Services Router along with one or more Telephony Interface
Modules (TIMs) to connect VoIP and legacy analog telephones and trunks over
IP networks. Only the TGM550 has an interface configurable through the J-Web
interface or JUNOS CLI. The TIMs are configured and administered from the
TGM550 CLI.
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TIM510
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Avaya E1/T1 Telephony Interface Module. Avaya VoIP module installed
in a Services Router to provide an E1 or T1 trunk connection over the Internet
to a telephone central office (CO). A TIM510 is configured and administered
from a TGM550 installed in the same router.
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TIM514
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Avaya Analog Telephony Interface Module. Avaya VoIP module installed
in a Services Router to connect individual telephones or trunk lines to the
Internet. A TIM514 is configured and administered from a TGM550 installed
in the same router.
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TIM521
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Avaya BRI Telephony Interface Module. Avaya VoIP module installed in
a Services Router to connect ISDN Basic Rate Interface (BRI) trunk lines to
a telephone central office (CO) over the Internet for data or voice transmission.
A TIM521 is configured and administered from a TGM550 installed in the same
router.
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