VoIP Blogging > Area Code Splits and Overlays
[Voip Blog] The first three digits of that number are considered the exchange. The first digit of the phone number can be 2 thru 9, the other two digits in the exchange can be anything.
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[CISCO(시스코) 3COM(쓰리콤) Extreme Nortel ALTEON Networks] CISCO CP-7940G IP-Phone: The Cisco Unified IP phone products include phones with large pixel-based displays to bring productivity-enhancing applications to the phones, as well as customization options that can be modified as needs change, and provide inline power support over Ethernet. The Cisco Unified IP Phone 7940G (Figure 1) is multiprotocol-enabled to support Session Initiated Protocol (SIP), Media Gateway Control Protocol (MGCP), as well as the Cisco Unified CallManager Skinny Client Control Protocol (SCCP).
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