User`s manual

MediaPack
SIP User's Manual 96 Document #: LTRT-65408
5.5.4 Mapping NPI/TON to Phone-Context
The Phone-Context table is used to configure the mapping of 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).
You can also configure the Phone Context table using the ini file parameter PhoneContext
(refer to Section 5.5.13 on page 132).
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To configure the Phone-Context tables, take these 6 steps:
1. Open the 'Phone Context Table' screen (Protocol Management menu >
Manipulation Tables submenu > Phone Context Table option); the 'Phone Context
Table' screen appears, as shown below.
Figure 5-15: Phone Context Table Screen
2. From the ‘Add Phone Context As Prefix' drop-down list, select 'Enable' to add the
received Phone-Context parameter as a prefix to outgoing ISDN SETUP Called and
Calling numbers, if necessary.
3. From the 'Phone Context Index' drop-down list, select the index number.