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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.
One variation of identifying the calling party on direct-dialed long-distance calls is a party code, usually a single digit inside a circle displayed on the phone's number tag. The dialing sequence for such calls is "1" (access number for DDD), the party code, the area code, and the desired number (1 + party code + area code + number).
Some of the first such services were call management related, call forwarding (busy and no answer), voice mail, call waiting, conference calling, calling name and number display, call screening, malicious caller identification, busy callback. [7]: Introduction xx The earliest deployed upper-layer protocols in the SS7 suite were dedicated to the ...
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Additional types of loop signaling are signals to the central office that the subscriber intends to initiate a second simultaneous call, a three-way conference call, or answer a second incoming call. This signal is called flashing or hook flash, and is performed by interrupting the loop for a fraction of a second, typically at least 300 ms.
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