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  2. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    The use of vertical is a somewhat dated reference to older switching methods and the fact that these services can only be accessed by a telephone subscriber, going up (vertically) inside the local central office instead of out (horizontally) to another telephone company.

  3. System identification number - Wikipedia

    en.wikipedia.org/wiki/System_Identification_Number

    This number space is 90% utilized for country ranges. Many countries do not use all of their allocated codes, hence the majority of codes are unused. SIDs are assigned to every carrier (e.g., Verizon, Sprint, Alltel) by national regulators or IFAST. SIDs are programmed into the phone when purchased.

  4. Supervision (telephony) - Wikipedia

    en.wikipedia.org/wiki/Supervision_(telephony)

    All call detail records (CDRs) produced should indicate a call was unanswered or unsuccessful, and therefore, incur no charge from the billing system. Some systems may not cut through the audio path until there is a positive indication that the called party answered the call—there may not be an audio connection until the answer signal is sent.

  5. 3pcc - Wikipedia

    en.wikipedia.org/wiki/3pcc

    The web server then creates a call between the user and a customer service representative. The call can be between two phones, a phone and an IP host, or two IP hosts. Third party call control is possible using only the mechanisms specified within RFC 3725. Indeed, many different call flows are possible, each of which will work with SIP ...

  6. Alltel - Wikipedia

    en.wikipedia.org/wiki/Alltel

    Alltel was a landline, wireless and general telecommunications services provider, primarily based in the United States.Before its wireless division was acquired by Verizon Wireless and AT&T, Alltel provided cellular service to 34 states and had approximately 13 million subscribers.

  7. Emergency service response codes - Wikipedia

    en.wikipedia.org/wiki/Emergency_service_response...

    In the United States, response codes are used to describe a mode of response for an emergency unit responding to a call. They generally vary but often have three basic tiers: Code 3: Respond to the call using lights and sirens. Code 2: Respond to the call with lights only (rarely allowable by state statutes)

  8. Fix sending and receiving issues with third-party email apps

    help.aol.com/articles/cant-send-or-receive-email...

    If your account is working on a web browser and you made sure you're using the right server settings, then update your email app to the newest version available. If you're still experiencing issues with your app, contact the manufacturer. Also, access your AOL Mail on a web browser. Keep in mind - For two-step verification, generate an app ...

  9. Conference call - Wikipedia

    en.wikipedia.org/wiki/Conference_call

    The more limited three-way calling is available (usually at an extra charge) on home or office phone lines. For a three-way call, the first called party is dialed. Then the hook flash button (or recall button) is pressed and the other called party's phone number is dialed. While it is ringing, flash/recall is pressed again to connect the three ...