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Dial tone
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#	Item
541	PDF Document Add to Reading List Source URL: docstore.mik.ua Language: English - Date: 2002-09-28 23:19:09 Ringback tone Call-progress tone Signal tone Disconnect tone Special information tones Reorder tone Technology Engineering Language DBm Dual-tone multi-frequency signaling Dial tone
542	PDF Document Add to Reading List Source URL: www.historyofphonephreaking.org Language: English - Date: 2008-08-21 12:13:25 Panel switch Dual-tone multi-frequency signaling Direct distance dialing Signalling System No. 7 Multi-frequency signaling Single-frequency signaling Number Five Crossbar Switching System Rotary dial Telephone Telephony Telephone exchanges Signaling
543	PDF Document Add to Reading List Source URL: www.itu.int Language: English - Date: 2003-06-11 12:00:40 Signal tone Off-hook tone RBU Special information tones Frequency modulation Ringtone Call-progress tone Reorder tone Dial tone Ringback tone
544	PDF Document Add to Reading List Source URL: focus.ti.com Language: English Goertzel algorithm Blue box Telephone keypad Harmonic Dial tone Radio technology Selective calling Electronic engineering Broadcast engineering Dual-tone multi-frequency signaling
545	PDF Document Add to Reading List Source URL: dougkerr.net Language: English - Date: 2013-07-22 19:24:27 Computer art Telephone exchange ASCII Dual-tone multi-frequency signaling Bell System Telephone Rotary dial Pulse dialing Bell Labs Telephony AT&T ASCII art
546	PDF Document Add to Reading List Source URL: edocs.mitel.com Language: English - Date: 2013-06-04 14:20:25 Mitel Voice-mail Telephone Rotary dial Call forwarding Dial tone Automatic callback Trimline telephone Telephony Electronic engineering Technology

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