Avaya 1140E User Manual Page 51

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Create the Dialing Plan file on the provisioning server 51
Entering a SIP URI address, however, is inconvenient for an IP Phone with
SIP Firmware unless a USB keyboard is attached. Also, the user must
explicitly press the send key (or use some method to indicate the end of the
URI) to indicate the completion of the SIP address. This is not something
that the user is accustomed to in a traditional PBX environment.
The alternative is to use a URI where numbers are used to reach the
far end. Using different access codes, the IP Phone with SIP Firmware
translates the digits entered into something that the server can understand
and remaps the number entered into different URIs. Some of the numbers
are mapped as intercom calls, some numbers are mapped as local Public
Switched Telephone Network (PSTN) calls, and some numbers are mapped
as public long-distant calls.
The issue is that until the IP Phone itself can determine the type of call, no
SIP INVITE message is sent. This is where the dialing plan comes into
effect. The call type is determined by the dialing plan. Based on the rules
defined in the dialing plan, once a match has been identified, the IP Phone
1140E with SIP Firmware sends the invite without the need to press the
send key. This behavior closely matches the traditional PBX operation.
The IP Phone 1140E with SIP Firmware design places no restriction in
the format of the SIP URI. The dialing plan is a scheme to match the user
experience with traditional PBX operation. It does not restrict the type of
URI that the user can use.
The IP Phone 1140E with SIP Firmware uses a dialing plan to recognize a
call as an emergency call when it sends an INVITE. The dialing plan can
have multiple emergency numbers. See the chapter "Emergency 911 -
Operator control of disconnect" (page 99) for information on the handling of
Emergency 911 calls by the IP Phone 1140E with SIP firmware.
The following is an example of a dialing plan.
SIP Fir mware Release 1.1 for IP Phone 1140E Administration
NN43113-300 02.05 Standard
27 May 2008
Copyright © 2008, Nortel Networks
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