635 results about "Call establishment" patented technology

In a communications network, voice and facsimile calls are established between first and second and second terminals via first and second media gateways in a communications network. Each gateway is capable of autonomous transitioning between a voice over IP (VoIP) call mpde and a facsimile ov er IP (FoIP) call mode. A bearer path for the call is established via a media gateway controller. During call setup, the media gateways exchange confirmation of each gateway's capability to perform autonomous transitioning between VoIP and FoIP call modes. The call is established as a VoIP call, and, on a determination by the media gateways that a facsimile call is required, each media gateway autonomously transitions between its VoIP and FoIP call modes without the intervention of the media gateway controller.

An improved access attempt procedure for call establishment is achieved by deriving a probability of access transmission as a function of both a priority level for access attempts and a random access cause, and performing link establishment authentication and security control call establishment based upon the deriving.

A method for establishing an emergency call between a user equipment within a radio coverage area and one of at least two points able to answer the call, the method comprising: receiving said emergency call request; determining a first estimate of the position of said user equipment within said coverage area; interrupting said call establishment by triggering a control point; and using the control point to select, based on said first position estimate, which one of said at least two answering points the call is established with.

The invention relates to the field of wireless communication, and discloses a multi-mode wireless terminal and a method for initiating a circuit-domain voice service by the same. The method disclosed by the invention comprises the following steps that when a first communication mode is in a data service connected state and a second communication mode is in an idle state, the first communication mode monopolizes a first antenna group, the first communication mode and the second communication mode share a second antenna group, and the second communication mode maintains the cell information by the second antenna group; when the second communication mode initiates the voice service, the second antenna group is monopolized by the second communication mode instead of being shared by the first communication mode and the second communication mode; the data service of the first communication mode is kept. According to the multi-mode wireless terminal and the method disclosed by the invention, the time delay for the voice service call establishment of the wireless terminal during the falling-back of a circuit domain is shortened, the first communication mode can be rapidly returned after the voice service is finished, and the concurrence of the voice service and the data service can still be supported after the circuit domain falls back to the second communication mode.

A method of authenticating an authorized entity via the telephone network is disclosed. A telephone call is placed from a telecommunications terminal to a server that comprises a valuable resource and that only provides the resource to authorized entities. When the terminal has already demonstrated its authorization to the server, the server indicates to the terminal that the terminal need not provide its authorization credentials. In contrast, when the terminal has not yet demonstrated its authorization to the server, the server indicates to the terminal that the terminal does need to provide its authorization credentials. The server indicates to the terminal whether or not it needs to provide its authorization credentials by deliberating waiting to establish the call with the terminal, wherein in the length of the wait is indicative of whether or not the terminal needs to provide its authorization credentials.

The invention discloses a method, a device and a system for realizing redirection in a communication system. The method mainly comprises the following steps: firstly, a page message aiming at user terminal is sent to the first network and the second network respectively, and the page message gets to a second network before the user terminal is put in the second network; after the user terminal receives page message through the first network, and determines that the page message is required to be redirected to the second network, the user terminal is reconnected into the second network, and answers to the page message issued by the second network. Therefore, the realization of the embodiment of the invention ensures that the time for cell reselection process and paging response process are minimized, and then the time delay of the entire call establishment process is reduced, and the service continuity in a coexisting network is ensured.

In situations in which one or both parties of a call cannot speak on a telephone, a voice call establishment request (5-0) from an calling terminal (A) to a called terminal (B) is processed as follows. The called terminal (B) is alerted and a two-way connection (5-14; 5-24 . . . 5-28) is established between the calling terminal (A) and the called terminal (B). In response to determining (3-10; 3-14; 5-8) that a two-way voice call between the calling terminal (A) and the called terminal (B) is not allowed; a mode server (MS, MS′) receives silent messages (5-14; 5-24) via a user interface (UI) of the called terminal (B) and conveys (5-14; 5-26 . . . 5-28) information based on said silent messages to the calling terminal (A).

The invention discloses a method, a system and a mobile terminal for encrypting a voice call. The method comprises the following steps of: when a calling mobile terminal carries out an encrypted call, informing an encryption identification for indicating encryption to a mobile switching center in a call establishment process; informing the encryption identification and a key subjected to encryption i.e. an encryption key to a called mobile terminal by the mobile switching center; and judging the received encryption identification by the called mobile terminal, then decrypting the encryption key, and carrying out an encrypted voice call with the calling mobile terminal. In the invention, the mobile terminals can freely select whether to encrypt the call process, and the mobile switching center encrypts the key in the process of transmitting the key, which can improve the security of the voice call between the mobile terminals; and in addition, the values of the key for encrypting and decrypting the call voice are different in different call processes, which can further improve the security of the voice call between the mobile terminals.