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Check this below link <br />
<a href="http://www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a008009485a.shtml" rel="ugc">http://www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a008009485a.shtml</a>
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Check this below link
http://www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a008009485a.shtml [http://www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a008009485a.shtml]

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raysonlee;<br />
<br />
no phone always says registration rejected
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raysonlee;

no phone always says registration rejected

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yes i hope so raysonlee is right 
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cisco 7912 phone, despite all of the settings used in the company continuously (Registration rejected) failure to give and re-launching
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cisco 7912 phone, despite all of the settings used in the company continuously (Registration rejected) failure to give and re-launching

cisco 7912 phone problem (Registration rejected)

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).