Caller ID on IP Side

Caller ID for analog interfaces is provided by the SIP From header containing the caller's name and "number", for example:

From: “John” <SIP:101@10.33.2.2>;tag=35dfsgasd45dg

If Caller ID is restricted (received from Tel or configured in the device), the From header is set to:

From: “anonymous” <anonymous@anonymous.invalid>; tag=35dfsgasd45dg

The P-Asserted (or P-Preferred) headers are used to present the originating party’s caller ID even when the caller ID is restricted. These headers are used together with the Privacy header.

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If Caller ID is restricted:

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The From header is set to “anonymous” <anonymous@anonymous.invalid>

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The ‘Privacy: id’ header is included

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The P-Asserted-Identity (or P-Preferred-Identity) header shows the caller ID

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If Caller ID is allowed:

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The From header shows the caller ID

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The ‘Privacy: none’ header is included

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The P-Asserted-Identity (or P-Preferred-Identity) header shows the caller ID

The caller ID (and presentation) can also be displayed in the Calling Remote-Party-ID header.

The Caller Display Information table (see Configuring Caller Display Information) is used for the following:

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FXS interfaces: To define the caller ID (per port) that is sent to IP.

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FXO interfaces: To define the caller ID (per port) that is sent to IP if caller ID isn’t detected on the Tel side, or when EnableCallerID = 0.

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Analog interfaces: To determine the presentation of the caller ID (allowed or restricted).

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To maintain backward compatibility: When the strings ‘Private’ or ‘Anonymous’ are set in the Caller ID/Name field, the caller ID is restricted and the value in the Presentation field is ignored.

The value of the ‘Presentation’ parameter in the Caller Display Information table can be overridden by configuring the ‘Presentation’ parameter in the Source Phone Number Manipulation for Tel-to-IP Calls table (see Configuring Source-Destination Number Manipulation Rules). Therefore, this table can be used to configure the presentation for specific calls according to source / destination prefixes.

The caller ID can be restricted/allowed (per port) using keypad features [KeyCLIR] and [KeyCLIRDeact] (FXS only).

The [AssertedIdMode] parameter configures the header that is used (in the generated INVITE request) to deliver the caller ID (P-Asserted-Identity or P-Preferred-Identity). Use the parameter [UseTelURIForAssertedID] to configure the format of the URI in these headers (sip: or tel:).

The parameter [EnableRPIheader] enables Remote-Party-ID (RPI) headers for calling and called numbers for Tel-to-IP calls.