For example, for a Tel-to-IP call with NPI/TON set as E164 National (values 1/2), the
device sends the following SIP INVITE URI:
sip:12365432;phone-context= na.e.164.nt.com
This is configured for entry 3 in the figure below. In the opposite direction (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.
To configure NPI/TON to SIP phone-context rules:
1. Open the Phone Context Table page (Configuration tab > VoIP menu > GW and IP
to IP submenu > Manipulations > Phone Context).
Figure 25-5: Phone Context Table Page
2. Configure the parameters as required. For a description of the parameters, see the
table below.
3. Click Submit to apply your changes.
4. To save the changes to flash memory, see 'Saving Configuration' on page 624.
Notes:
• 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.
• The Phone Context table can also be configured using the table ini file
parameter, PhoneContext (see 'Number Manipulation Parameters' on
page 954) or CLI command, configure voip > gw manipulations phone-
context-table.
Phone-Context Parameters Description
Parameter Description
Add Phone Context As
Prefix
CLI: configure voip > gw
manipulations general-
setting > add-ph-cntxt-as-
pref
[AddPhoneContextAsPre
fix]
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
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