Telephone exchanges

#	Item
271	Octber2004_8.pmd Add to Reading List Source URL: www.telephonecollectors.org Language: English - Date: 2013-07-15 17:37:59 Trimline telephone AT&T Rotary dial Western Electric Henry Dreyfuss Telephone Pulse dialing Automatic Electric Rotary system Telephony Alcatel-Lucent Telephone exchanges
272	PDF Document Add to Reading List Source URL: www.sasktel.com Language: English - Date: 2010-07-07 19:02:25 Telephone exchanges Electronics Avaya Meridian Norstar Videotelephony Nortel Voice-mail Voice over IP Call centre Telephony Electronic engineering Computer telephony integration
273	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