SIP User's Manual
170
Document #: LTRT-68808
Mediant
2000
3.4.7.3.3 Mapping NPI/TON to Phone-Context
The 'Phone-Context Table' page is used to map NPI and TON to the Phone-Context SIP
parameter. When a call is received from the ISDN, the NPI and TON are compared against
the table and the Phone-Context value is used in the outgoing SIP INVITE message. The
same mapping occurs when an INVITE with a Phone-Context attribute is received. The
Phone-Context parameter appears in the standard SIP headers where a phone number is
used (Request-URI, To, From, Diversion).
¾
To configure the Phone-Context tables, take these 4 steps:
1.
Open the 'Phone Context Table' page (
Configuration
tab >
Protocol Configuration
menu >
Manipulation Tables
submenu >
Phone Context Table
page item).
Figure
3-69: Phone Context Table Page
2.
Configure the Phone Context table according to the table below.
3.
Click the
Submit
button to save your changes.
4.
To save the changes to flash memory, refer to ''Saving Configuration'' on page
Notes:
•
Several rows with the same NPI-TON or Phone-Context are allowed. In
such a scenario, a Tel-to-IP call uses the first match.
•
Phone-Context '+' is a unique case as it doesn't appear in the Request-
URI as a Phone-Context parameter. Instead, it's added as a prefix to the
phone number. The '+' isn't removed from the phone number in the IP-to-
Tel direction.
•
You can also configure the Phone Context table using the
ini
file table
parameter PhoneContext (refer to ''Number Manipulation and Routing
Parameters'' on page
).
Table
3-42: Phone-Context Parameters Description
Parameter
Description
Add Phone Context As Prefix
[AddPhoneContextAsPrefix]
Determines whether the received Phone-Context parameter is
added as a prefix to the outgoing ISDN SETUP message with Called
and Calling numbers.
[0]
Disable = Disable (default).
[1]
Enable = Enable.
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