SIP Access To Parameters in To Header

This feature gives the host read and write access to the parameter field of the "To" header of the initial INVITE request. The SIP stack reports to the host the parameters (if present) in the "To" header of the INVITE within the Request for Service with Data or PPL Event Indication for subsequent data. This reporting is disabled by default.

The SIP stack uses the parameters provided by the host in the Outseize or Route Control messages (and PPL Event Request message for subsequent data) for the "To" header of an outbound initial INVITE message.

The Internet draft-yu-tel-url-08.txt introduced the following three parameters in the tel URI to support number portability (NP) and free phone service:

The required or desired parameters might be included in the parameter field of the "To" header in the INVITE request. In particular, customers can have the CSP report the "cic=" parameter to the host. For outbound calls, the host must supply this parameter.

Important! The SIP stack does not support telephone URI fully but it allows telephone numbers to be used as username or hostname.

The following is an example of the INVITE message with the "cic=" parameter highlighted.

From: <sip:6187851270@216.138.56.76>;tag=fdf55690-d88a384c-13c4-348ce5-46943ed9-348ce5

Remote-Party-ID: <sip:6187851270@216.138.56.76;user=phone>; party=calling; privacy=off

This feature allows the host to instruct the SIP stack to insert parameters in the "To" header of the outbound INVITE request. By default, the SIP stack does not add this parameter.

The CSP acts as the User Agent Server (UAS) reporting to the host the parameter, in the inbound INVITE message, within the Request for Service message or PPL Event Indication message for subsequent data. This parameter is reported using the new TLV - SIP To Parameter (0x2945).

This feature is disabled by default. To enable it, set bit 22 of the data part in the SIP Message Information Mask TLV (0x027F) and send it within the VoIP Protocol Configure (0x00EE) message.

Session-Initiation Protocol. A signaling protocol used for establishing sessions in an IP network. A session could be a simple, two-way telephone call, or it could be a collaborative multi-media conference session.

See Programmable Protocol Language.

Outgoing call setup during real-time call processing on a specific channel.

A condition that, when met, drives a state machine from one state to another. A condition that drives a Component out of its current state by invoking an associated primitive.

See Integrated Services Digital Network User Part.

Positive acknowledgment to a message

Real-Time Transport Protocol. Supports transport of real-time data like interactive voice and video over packet-switched networks.

Tag-Length-Value block. A standardized block that allows data to inserted in a standard way into API messages.

Voice over Internet Protocol. The delivery of voice information in digital form in discrete packets rather than in the traditional circuit-committed protocols of the public-switched telephone network (PSTN).

See Converged Services Administrator.

CSA. GUI-based tool used to configure, provision and monitor a Excel platform related to, for example, SIP, H.323, and VDAC Resouce Attributes.