User's Manual

Create the Dialing Plan file on the provisioning server
A
dialing plan essentially describes the number and pattern of digits that a user dials to reach
a particular telephone number. Access codes, area codes, specialized codes, and
combinations of the number of digits dialed are all part of a dialing plan.
The purpose of the dialing plan is so that the end user does not have to press the send or
pound key (#) to have the IP Deskphone with SIP Software send the initial message to start
the call.
Dialing a telephone number on an IP Deskphone that supports SIP can be different than dialing
a number from a traditional telephone. SIP signaling is communicated through a SIP URI to
get to the far end. For example, you can key in the SIP address, jsmith@company_name.com
to reach John Smith. When the IP Deskphone with SIP Software receives this address, the
dialing plan is bypassed and the IP Deskphone uses the SIP URI to send a SIP INVITE to
jsmith@company_name.com (INVITE sip: jsmith@company_name.com).
Entering a SIP URI address, however, is inconvenient for an IP Deskphone with SIP Software.
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 Deskphone with SIP Software 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-
distance calls.
The issue is that until the IP Deskphone 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 Deskphone with SIP Software sends the invite without the need to press the
send key. This behavior closely matches the traditional PBX operation.
The IP Deskphone with SIP Software 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 Deskphone with SIP Software uses a dialing plan to recognize a call as an call when
it sends an INVITE. The dialing plan can have multiple emergency numbers. See the chapter
Emergency Services on page
197 for information on the handling of Emergency calls by the
IP Deskphone with SIP software.
The following is an example of a dialing plan.
Create the Dialing Plan file on the provisioning server
SIP Software for Avaya 1200 Series IP Deskphones-Administration September 2013 87