Version 5.8 199 October 2009
SIP User's Manual 3. Web-Based Management
For example, for a Tel-to-IP call with NPI/TON set as E164 National (values 1/2), the device
sends the outgoing SIP INVITE URI with the following settings: “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.
¾ To configure the Phone-Context tables:
1. Open the 'Phone Context Table' page (Configuration tab > Protocol Configuration
menu > Manipulation Tables submenu > Phone Context Table page item).
Figure 3-163: Phone Context Table Page
2. Configure the Phone Context table according to the table below.
3. Click the Submit button to save your changes.
4. To save the changes to flash memory, refer to ''Saving Configuration'' on page 237.
Notes:
• Several rows with the same NPI-TON or Phone-Context are allowed. In
such a scenario, a Tel-to-IP call uses the first match.
• Phone-Context '+' is a unique case as it doesn't appear in the Request-
URI as a Phone-Context parameter. Instead, it's added as a prefix to the
phone number. The '+' isn't removed from the phone number in the IP-to-
Tel direction.
• You can also configure the Phone Context table using the ini file table
parameter PhoneContext (refer to ''Number Manipulation and Routing
Parameters'' on page 408).
Table 3-25: Phone-Context Parameters Description
Parameter Description
Add Phone Context As Prefix
[AddPhoneContextAsPrefix]
Determines whether the received Phone-Context parameter is
added as a prefix to the outgoing Called and Calling numbers.
 [0] Disable = Disable (default).
 [1] Enable = Enable.
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