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  2. Cisco Webex - Wikipedia

    en.wikipedia.org/wiki/Cisco_WebEx

    It was founded as WebEx in 1995 and acquired by Cisco Systems in May 2007. Its headquarters are in San Jose, California. [2] Its software products include Webex App, Webex Suite, Webex Meetings, Webex Messaging, Webex Calling, Webex Contact Center, and Webex Devices. [3] All Webex products are part of the Cisco Systems collaboration portfolio. [4]

  3. ISDN User Part - Wikipedia

    en.wikipedia.org/wiki/ISDN_User_Part

    Call progress (CPG) — Contains additional information about the progress of a call. Normally sent after the ACM when the status of the call changes from that reported in the ACM. Answer message (ANM) — Sent when the subscriber picks up the phone, a resource is connected or answer supervision is returned by an interworking point.

  4. Videotelephony - Wikipedia

    en.wikipedia.org/wiki/Videotelephony

    Videotelephony (also known as videoconferencing or video calling) is the use of audio and video for simultaneous two-way communication. [1] Today, videotelephony is widespread. There are many terms to refer to videotelephony. Videophones are standalone devices for video calling (compare Telephone).

  5. H.323 - Wikipedia

    en.wikipedia.org/wiki/H.323

    H.323 call signaling is based on the ITU-T Recommendation Q.931 protocol and is suited for transmitting calls across networks using a mixture of IP, PSTN, ISDN, and QSIG over ISDN. A call model, similar to the ISDN call model, eases the introduction of IP telephony into existing networks of ISDN-based PBX systems, including transitions to IP ...

  6. Short Message Service technical realisation (GSM) - Wikipedia

    en.wikipedia.org/wiki/Short_Message_Service...

    Call flow for the mobile terminated Short Message Service. The figure to the right depicts a call flow for mobile-terminated Short Message delivery. [1] For the sake of simplicity, some of the interactions between the VMSC and VLR, and VMSC and Handset, have been omitted, and only the case when SMS home routing is not in use is shown.

  7. Conference call - Wikipedia

    en.wikipedia.org/wiki/Conference_call

    Conference calls can be designed so that the calling party calls the other participants and adds them to the call; however, participants are usually able to call into the conference call themselves by dialing a telephone number that connects to a "conference bridge," which is a specialized type of equipment that links telephone lines.

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