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About John K

This article has been published by AccessDirect, a leading service provider of PBX phone systems (hosted/virtual). We also provide voicemail, fax mail, follow me call forwarding, local phone numbers, and toll free numbers. Visit us at www.messagingservice.com.

John K represents AccessDirect, a leading provider of Hosted PBX, voice mail, fax mail, local phone numbers, and toll free numbers.
SIP protocol

Session Initiation Protocol (SIP) is a protocol that initiates and manages interactive user sessions involving voice, video, instant messaging, and other such multimedia sessions.