AudioCodes Mediant 800 MSBG - Figure 3-80: Phone Context Table Page

SIP User's Manual 160 Document #: LTRT-12804
Mediant 800 MSBG
Parameter Description
Web/EMS: Prefix to Add The number or string that you want added to the front of the telephone
number. For example, if you enter '9' and the phone number is 1234,
the new number is 91234.
Web/EMS: Suffix to Add The number or string that you want added to the end of the telephone
number. For example, if you enter '00' and the phone number is 1234,
the new number is 123400.
Web/EMS: Number of
Digits to Leave
The number of digits that you want to retain from the right of the phone
number.
Web: Presentation
EMS: Is Presentation
Restricted
Determines whether Caller ID is permitted:
 Not Configured = Privacy is determined according to the Caller ID
table (see ''Configuring Caller Display Information'' on page 185).
 [0] Allowed = Sends Caller ID information when a call is made using
these destination/source prefixes.
 [1] Restricted = Restricts Caller ID information for these prefixes.
Note: If 'Presentation' is set to 'Restricted' and the AssertedIdMode
parameter is set to 'P-Asserted', then the From header in the INVITE
message includes the following: From: 'anonymous' <sip:
anonymous@anonymous.invalid> and 'privacy: id' header.
3.3.2.11.2.5 Mapping NPI/TON to SIP Phone-Context
The 'Phone-Context Table' page allows you to map Numbering Plan Indication (NPI) and
Type of Number (TON) to the SIP Phone-Context parameter. When a call is received from
the ISDN/Tel, 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 attribute is received. The Phone-Context parameter
appears in the standard SIP headers where a phone number is used (Request-URI, To,
From, Diversion).
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 > VoIP menu > GW and IP
to IP submenu > Manipulations submenu > Phone Context).
Figure 3-80: Phone Context Table Page