User`s guide

72 Dialogic
®
1000 and 2000 Media Gateway Series User’s Guide
Parameter Reference
3.3.8 Privacy Headers Group
Note: The Privacy Headers parameters only apply to a DMG2000 that is configured for SIP (on the VoIP
side) and ISDN (on the TDM side).
Privacy Headers are used in SIP messages to specify to the receiving side how to present ‘Calling
Party ID’ data to a user. When privacy is enabled, the normal ‘From’ fields in a SIP message are
masked and the actual ‘Calling Party ID’ is placed in ‘privacy headers’. An example is shown
following:
From: “Anonymous” sip:[e-mail]
P-Asserted-Identity: “Mary Doe” sip:1001@192.168.1.30
In the example, the normal data in the ‘From’ fields are masked (with anonymous) and the actual
data are placed in the ‘P-Asserted-Identity’ fields. The ‘From’ fields are presented to the user,
while the ‘P-Asserted-Identity’ fields are used only for routing.
The ISDN protocol contains fields analogous to the SIP privacy headers.
The Privacy Headers subgroup includes the following parameters:
• Enable Privacy Headers
• Privacy Header Method
Enable Privacy Headers
Description: When Privacy Headers are enabled, the gateway translates received SIP privacy
headers to transmitted ISDN privacy fields and vice versa. When disabled, the gateway ignores any
received SIP privacy headers or any received ISDN privacy fields.
Allowed Values:
• Yes = Enables translation between SIP Privacy Headers and ISDN privacy fields.
• No = Disables translation between SIP Privacy Headers and ISDN privacy fields.
Default Value = No
INI File Parameter Name = sipPrivacyHdrEnabled
Privacy Header Method
Description: The SIP protocol provides for two methods to keep the ‘Calling Party ID’ data
private. Both methods modify the ‘From’ header by changing the fields to ‘anonymous’. They
differ on how the actual ‘Calling Party ID’ data is presented. The first method is shown in the
preceding example, that is, P-Asserted-Identity’ is used. The second method uses ‘Remote-Party-
ID’. Both methods supply the same data, just in somewhat different formats.
Note: Privacy Header Method is relevant only when Enable Privacy Headers is set to ‘yes’.