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  2. Call forwarding - Wikipedia

    en.wikipedia.org/wiki/Call_forwarding

    Call forwarding can be Conditional or Unconditional. Conditional call forwarding only works when the conditions set by the customers met while Unconditional call forwarding works in all cases irrelevant of network coverage. In Europe, most networks indicate that unconditional call forwarding is active with a special dial tone. When the phone is ...

  3. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    As CLASS was an AT&T trademark, the term vertical service code was adopted by the North American Numbering Plan Administration. 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 ...

  4. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    An intermediary machine or process rejected the call attempt. [25] This contrasts with the 607 (Unwanted) SIP response code in which a human, the called party, rejected the call. The intermediary rejecting the call should include a Call-Info header with "purpose" value "jwscard", with the jCard [26] with contact details. The calling party can ...

  5. Forwarding - Wikipedia

    en.wikipedia.org/wiki/Forwarding

    Call forwarding, a telephony feature that allows calls to one phone number to be forwarded to another number Remote call forwarding, a telephony feature that allows call forwarding to be activated remotely; Cisco Express Forwarding, an advanced layer 3 switching technology used mainly on the enterprise core network or the Internet

  6. Unstructured Supplementary Service Data - Wikipedia

    en.wikipedia.org/wiki/Unstructured_Supplementary...

    USSD on a Sony Ericsson mobile phone (2005). Unstructured Supplementary Service Data (USSD), sometimes referred to as "quick codes" or "feature codes", is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator's computers.

  7. Remote call forwarding - Wikipedia

    en.wikipedia.org/wiki/Remote_call_forwarding

    Remote call forwarding is also a means for a suburban business to obtain a city-centre local number (with its full large-city coverage area) for inbound calls; while cheaper than a foreign exchange line, this can reduce long-distance telephony costs in markets where local calls are flat-rated but trunk calls are expensive.

  8. Routing in the PSTN - Wikipedia

    en.wikipedia.org/wiki/Routing_in_the_PSTN

    Routing in the PSTN is the process of forwarding telephone calls between the constituent telephone networks that comprise the public switched telephone network (PSTN). Telephone calls are routed across a network of potentially many switching systems, often owned by different telephone carriers. Switching systems are connected with trunks. Each ...

  9. Call waiting - Wikipedia

    en.wikipedia.org/wiki/Call_waiting

    Call waiting is a telephone service where a subscriber can accept a second incoming telephone call by placing an in-progress call on hold—and may also switch between calls. With some providers it can be combined with additional features such as conferencing, call forwarding, and caller ID. Call waiting is intended to alleviate the need to ...