Nortel Networks SRG50 - Manual (Page 97)

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SRG50 Configuration Guide
Glossary
BDP Both Dialing Plans.
A dialing plan option that is supported on the main office only. The SRG supports
CDP or UDP only. If the main office is running BDP, the SRG zone must be
configured to allow either CDP or UDP, not both.
branch office A system that is remote from the main office but provides telephony services using
the main office servers. When a branch office is a survivable remote gateway,
telephony services are provided by the branch office if communication with the main
office is lost.
call routing Coding that is configured on a system to ensure that outgoing calls are directed to the
correct trunks and incoming calls are directed to the correct device(s) on the system.
(see also: dialing plan)
CDP Coordinated Dialing Plan.
Under the recommended Coordinated Dialing Plan, the Branch User ID can be an
extension (for example, 4567). For more information about CDP, consult the main
office documentation that covers dialing plans.
dialing plan
Each system uses a specific numbering configuration (dialing plan) that determines
how calls will be handled over a private or public network. (see also: call routing)
FXO Foreign eXchange Office: an interface that connects to the PSTN central office and is
the interface offered on a standard telephone. Example: RJ-11 connector that allows
analog connection to the central office.
gatekeeper The gatekeeper is an IP network application that directs IP traffic to all the systems on
the network. Parameters for both the main office and the SRG must be assigned to all
gatekeepers on the network. If the gatekeeper is down, the SRG attempts to connect
to the alternate gatekeeper, if there is one. If the alternate gatekeeper is also down, or
there is no alternate gatekeeper, the SRG IP telephones remain registered with the
main office, but calls cannot be sent to the SRG.
gateway The IP portal on each system that establishes the VoIP trunk.
H.323 An IP gateway protocol used by both the main office and the SRG to create VoIP
trunking connections.
IP Internet Protocol
IP specifies the format of packets, also called datagrams, and the addressing scheme
in the TCP/IP protocol suite. Where IP defines the packet and addressing scheme,
Transport Control Protocol (TCP) establishes a virtual connection between a
destination and a source.
IP telephones Telephones that can connect directly with a TCP/IP network. Also known as internet
telephones.
local mode The operating mode of redirected SRG IP telephones when connectivity with the
main office is unavailable.