AudioCodes Mediant 500L MSBR

User's Manual 396 Document #: LTRT-10466
Mediant 500L MSBR
26.7 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/Tel 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 in the Web interface. You can also configure this using the table ini file parameter,
PhoneContext or CLI command, configure voip > gw manipulations phone-context-table.
 To configure NPI/TON-SIP phone-context mapping rules:
1. Open the Phone Context Table page (Configuration tab > VoIP menu > GW and IP
to IP > Manipulations > Phone Context).
2. Click Add; the following dialog box appears:
Figure 26-5: Phone Context Table Page
3. Configure a mapping rule according to the parameters described in the table below.
4. Click Submit, and then save ("burn") your settings to flash memory.
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.
Table 26-6: Phone Context Table Parameter Description
Parameter Description
Index
[PhoneContext_Index]
Defines an index number for the new table record.
Add Phone Context As Prefix
CLI: configure voip > gw
manipulations general-setting
> add-ph-cntxt-as-pref
[AddPhoneContextAsPrefix]
Determines whether the received SIP 'phone-context' parameter is
added as a prefix to the outgoing ISDN Setup message (for digital
interfaces) with called and calling numbers.
 [0] Disable (default)
 [1] Enable
NPI Defines the Number Plan Indicator (NPI).