Caller ID on IP Side

Caller ID for analog interfaces (Tel-to-IP calls) 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), the From header is set to:

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

The P-Asserted (or P-Preferred) headers present the originating party’s caller ID even when 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 contains the caller ID.

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If Caller ID is allowed:

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The From header contains 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 contains 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 Tel-to-IP calls:

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FXS interfaces: Defines caller ID per FXS port that is sent to IP.

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FXO interfaces: Defines caller ID per FXO port that. The caller ID is sent to the IP side if caller ID isn’t detected on the Tel side or when the [EnableCallerID] parameter is configured to 0.

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FXS and FXO interfaces: Defines the presentation of 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.