Mapping NPI/TON to SIP Phone-Context
The Phone Contexts table lets you configure up to 20 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 Tel side, the device searches the table for a matching rule (i.e., same NPI and TON values). If a matching rule is found, the device uses the rule's corresponding 'phone-context' value 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] or CLI (configure voip > gateway manipulation phone-context-table).
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To configure NPI/TON-SIP phone-context mapping rules: |
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Open the Phone Contexts table (Setup menu > Signaling & Media tab > Gateway folder > Manipulation > Phone Contexts). |
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Click New; the following dialog box appears: |
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Configure a mapping rule according to the parameters described in the table below. |
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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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To add the incoming SIP 'phone-context' parameter as a prefix to the outgoing ISDN Setup message (for digital interfaces) with called and calling numbers, from the 'Add Phone Context As Prefix' drop-down list (AddPhoneContextAsPrefix), select Enable. |
Phone Contexts table Parameter Description
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'Index'
[Index]
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Defines an index number for the new table row.
Note: Each row must be configured with a unique index.
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'NPI'
npi
[Npi]
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Defines the Number Plan Indicator (NPI).
For a detailed list of the available NPI/TON values, see Numbering Plans and Type of Number.
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'TON'
ton
[Ton]
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Defines the Type of Number (TON).
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[1] International-Level2 Regional |
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[2] National-Level1 Regional |
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[3] Network-PSTN Specific |
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[4] Subscriber-Level0 Regional |
The applicable values depend on the NPI value:
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If you select Unknown as NPI, you can select Unknown. |
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If you select Private as NPI, you can select one of the following: |
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[1] International-Level2 Regional |
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[2] National-Level1 Regional |
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[3] Network-PSTN Specific |
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[4] Subscriber-Level0 Regional |
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If you select E.164 Public as NPI, you can select one of the following: |
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✔
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[1] International-Level2 Regional |
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[2] National-Level1 Regional |
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[3] Network-PSTN Specific |
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✔
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[4] Subscriber-Level0 Regional |
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'SIP Phone-Context'
context
[Context]
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Defines the SIP 'phone-context' URI parameter.
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