User's Manual 484 Document #: LTRT-89730
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24.7 Mapping NPI/TON to SIP Phone-Context
The Phone Context table lets you configure rules for mapping the Numbering Plan
Indication (NPI) and Type of Number (TON) to the SIP 'phone-context' parameter, and vice
versa. The 'phone-context' parameter appears in the standard SIP headers where a phone
number is used (i.e., Request-URI, To, From, and Diversion). When a call is received from
the ISDN side, the NPI and TON are compared against the table and the matching 'phone-
context' value is used in the outgoing SIP INVITE message. The same mapping occurs
when an INVITE with a 'phone-context' parameter is received.
For example, for a Tel-to-IP call with NPI/TON set as E164 National (values 1/2), the
device can send the following SIP INVITE URI:
sip:12365432;phone-context= na.e.164.nt.com
For an IP-to-Tel call, if the incoming INVITE contains this 'phone-context' (e.g. "phone-
context= na.e.164.nt.com"), the NPI/TON of the called number in the outgoing Setup
message is changed to E164 National.
The following procedure describes how to configure NPI/TON-SIP phone-context mapping
rules through the Web interface. You can also configure it through ini file (PhoneContext).
 To configure NPI/TON-SIP phone-context mapping rules:
1. Open the Phone Context table (Configuration tab > VoIP menu > Gateway >
Manipulations > Phone Context).
2. Click Add; the following dialog box appears:
Figure 24-5: Phone Context Table - Add Row Dialog Box
3. Configure a mapping rule according to the parameters described in the table below.
4. To add the incoming SIP 'phone-context' parameter as a prefix to the outgoing ISDN
Setup message with called and calling numbers, from the 'Add Phone Context As
Prefix' drop-down list (AddPhoneContextAsPrefix), select Enable.
5. Click Add.
Note: You can configure multiple rows with the same NPI/TON or same SIP 'phone-
context'. In such a configuration, a Tel-to-IP call uses the first matching rule in the
table.
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