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    • How to Dial International Phone Numbers

      How to Dial International Phone Numbers

      With the expansion of Voice over IP and cellular phone technologies over the past decade, it has never been more cheaper to call international phone numbers. A common barrier for consumers trying to call friends, family, or business contacts that live abroad is determining how to dial international phone numbers from your country. International Dialing 

    • NEBS (Network Equipment-Building System)

      NEBS (Network Equipment-Building System)

      NEBS (Network Equipment-Building System) is a standard for telephony equipment. NEBS was developed in the 1970's by Bell Labs (now Telcordia). Many equipment vendors build their equipment to NEBS standards, even when they do not intend for their equipment to be placed in a Central Office. Equipment vendors do this because compliance with the NEBS

    • SS7 (Signaling System 7)

      SS7 (Signaling System 7)

      SS7 (Signaling System 7) is a standard for control signaling in the PSTN (Public Switched Telephone Network. SS7 signaling is done out-of-band, meaning that SS7 signaling messages are transported over a separate data connection. This represents a significant security improvement over earlier systems which used in-band signaling. The first CCS protocol was the Signaling System

    • Cell Phone Frequencies

      Cell Phone Frequencies

      Cell phone frequencies are the frequency ranges within the Ultra High Frequency (UHF) band that are designated for cell phone use. Bluetooth devices, wireless networks, and television signals also use this frequency band. Although cellular phone systems divide cities and geographic areas into smaller cells of coverage, it allows for a fair amount of frequency

    • Blue Box

      Blue Box

      Blue boxes use a 2600hz tone to size control of telephone switches that use in-band signaling. The caller may then access special switch functions, with the usual purpose of making free long distance phone calls, using the tones provided by the Blue Box. To quote Karl Marx, blue boxing has always been the most noble

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