Call-establishing method for realizing single-conversation color ring back tone service

Abstract

The invention discloses a call-establishing method for realizing single-conversation coloring ring back tone service. The method comprises the steps as follows: a calling party initiates a call, and a coloring ring back tone application server (AS) plays media information to the calling party in a single-conversation way; a called party answers the call, and after receiving the response information of the called party and before transmitting the response information, the coloring ring back tone AS requests the called party to send an SDP request; the coloring ring back tone AS sends the SDP request to the calling party after receiving the SDP request sent by the called party; and the calling party, the coloring ring back tone AS and the called party realize the call establishment by a standard process. The technical proposal improves the processing after the called party responds, reduces the interactive steps after the response and adjusts the time for starting charging, thereby simplifying the process between responding and starting the call greatly, improving the experience of a user and avoiding charging by mistake.

Description

technical field [0001] The invention relates to the communication field, and more specifically relates to a call establishment method for realizing single-dialogue color ring service in an IP multimedia subsystem. Background technique [0002] IP (Internet Protocol, referred to as IP) multimedia subsystem (IPMultimedia Core Network Subsystem, referred to as IMS) is an IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP) , build an open and flexible business environment, support multimedia applications, and provide users with rich multimedia services. [0003] In the IMS service system, the control layer and the service layer are separated, and the control layer does not provide specific services, but only provides necessary functions such as triggering, routing, and charging to the service layer. The service triggering and control functions in the control layer are completed by the Call Session Control Function (CSCF for short), and the CS...

AI Technical Summary

Problems solved by technology

[0034] The disadvantage of the prior art is that the billing starts too early, and after the billing starts, there are still a lot of signaling exchanges to start the call, so that the billing information is quite different from the actual situation, which will cause the user's feeling Very bad; and after the called party answers, there are still many signaling exchanges before the call can be started. These signaling exchanges will obviously take some time, and the user will feel very strange, and may even hang up the call because there is a problem

In addition, the media types that can be used in the CRBT service solution in the prior art are limited by the media type specified when the calling party makes a call, and when the media type of the CRBT service only includes audio, even if the calling and called users have the video call function terminal and the caller is willing to make a video call, they may only be able to use audio calls after answering, which is quite limited

Images