User's Manual

get to the far end. For example, you can key in the SIP address, [e-mail] 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
[e-mail] (INVITE sip: [e-mail]).
Entering a SIP URI address, however, is inconvenient for an IP Deskphone with SIP Software
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 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 189 for information on the handling of Emergency calls by the
IP Deskphone with SIP software.
An example of a dialing plan is provided below.
Create the Dialing Plan file on the provisioning server
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