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  2. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    Indicates that the destination was temporarily unavailable, so the server has queued the call until the destination is available. A server may send multiple 182 responses to update progress of the queue. [1]: §21.1.4 183 Session Progress This response may be used to send extra information for a call which is still being set up. [1]: §21.1.5

  3. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    The high frequencies may be the same volume as – or louder than – the low frequencies when sent across the line. The loudness difference between the high and low frequencies can be as large as 3 decibels (dB) and is referred to as "twist." The duration of the tone should be at least 537 ms. [1]

  4. Intercept message - Wikipedia

    en.wikipedia.org/wiki/Intercept_message

    The number and digits at the end identify the network edge or Tandem switch the caller's local exchange company routed the call to. There is also a network message heard when an attempt to route a call to a nodal or ISDN T1 on the terminating end fails due to no call set-up signal from the PBX being received by the far-end Tandem or edge switch ...

  5. Grade of service - Wikipedia

    en.wikipedia.org/wiki/Grade_of_service

    The first criterion is the probability of packet losses or delays in already accepted calls. The second criterion refers to the probability that a new incoming call will be rejected or blocked. To avoid the former, broadband networks limit the number of active calls so that packets from established calls will not be lost due to new calls arriving.

  6. Session Initiation Protocol - Wikipedia

    en.wikipedia.org/wiki/Session_Initiation_Protocol

    Signal termination of a dialog and end a call. This message may be sent by either endpoint of a dialog. RFC 3261: CANCEL: Cancel any pending request. Usually means terminating a call while it is still ringing, before answer. RFC 3261: UPDATE: Modify the state of a session without changing the state of the dialog. RFC 3311: REFER

  7. Update AOL Mail settings - AOL Help

    help.aol.com/articles/aol-mail-mail-settings

    • Mail Away Message Create and enable away messages. • Contacts Choose how you want your Contacts displayed and sorted. • New Mail Select the sound you want played when new email arrives. • Reading Select how you want your emails to be displayed in your inbox. • Today on AOL Select the box to show latest news, unread messages, and ...

  8. Mobile phone signal - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone_signal

    The volume of network traffic can also cause calls to be blocked or dropped due to a disaster or other mass call event which overloads the number of available radio channels in an area, or the number of telephone circuits connecting to and from the general public switched telephone network

  9. AOL Mail Help - AOL Help

    help.aol.com/products/new-aol-mail

    You've Got Mail!® Millions of people around the world use AOL Mail, and there are times you'll have questions about using it or want to learn more about its features. That's why AOL Mail Help is here with articles, FAQs, tutorials, our AOL virtual chat assistant and live agent support options to get your questions answered.