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   Session Initiation Protocol - SIP Definition and Diagram
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cellpadding=0 cellspacing=0 width=160><tbody><tr><td><p align=center><font face="arial, helvetica"color=#FF0000 size=2> <b> Introduction to Session Initiation Protocol - SIP </b> </font></p><tr><td align=center><p align=center><a href=http://www.althosbooks.com/intoseinprs.html> <img alt="Introduction to Session Initiation Protocol - SIP Book"align=center border=0 height=101 hspace=0 src=http://www.althos.com/presskits/0972805389/eB_Introduction_to_SIP_cover_web_small.jpg vspace=0 width=79> </a></p><tr><td><p align=center><font face="arial, helvetica"size=1> <a href=http://www.althosbooks.com/intoseinprs.html> more details </a> </font></p></table></div> <div align=center><table border=0 cellpadding=0 cellspacing=0 width=160><tbody><tr><td><p align=left><font face=Tahoma size=2> <b> Search VoIP Dictionary </b> </font><table align=center bgcolor=#C0C0C0 border=0 cellpadding=1 cellspacing=1 height=53><form action=http://www.VoIPDictionary.com/aw_dictionary_widget_VoIP.asp 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//--></script> <script src=http://pagead2.googlesyndication.com/pagead/show_ads.js></script></p><td bgcolor=#FFFFFF height=376 valign=top width=691><h1>  <img border=0 height=12 src=http://www.wirelessdictionary.com/images/go.gif width=12>   <font size=4> Session Initiation Protocol - SIP </font></h1> <p style="margin-left: 8; margin-top: 10"><font face=Tahoma size=2> Session initiation protocol is a <b> set of text commands and processes </b> that work with applications (application layer) to setup, manage, and terminate communication sessions. SIP is a simplified version of the ITU H.323 packet multimedia system. SIP is defined in RFC 2543. </font></p> <font face=Tahoma size=2> <p style="margin-left: 8; margin-top: 10">This figure shows how a SIP system uses relatively simple <b> text messages </b> to setup and <b> control telephone calls </b> . This diagram shows how a telephone has SIP capability that is controlled by a call server. This SIP based telephone is called a User Agent (UA). The User Agent (UA) is actually a gateway that converts audio (e.g. sound) and control information (e.g. dialed digits) into packets that can be routed through a data network (such as the Internet) to call servers and other User Agents (UAs.) The control packets are sent to and from the call server to request and receive calls. Call servers may communicate with other call servers to setup distant call connections. This diagram shows how a distant call server controls a User Agent (UA) gateway that allows calls to connect from the Internet to another telephone.</p> <p style="margin-left: 8; margin-top: 10"align=center><img alt="IP Telephony (VOIP) System Diagram"border=0 height=257 src=http://www.althos.com/sample_diagrams/ag_SIP_System_Overview_low_res.jpg width=468></p> <p style="margin-left: 8; margin-top: 10"align=center>Session Initiation Protocol - SIP System Diagram</p> </font> <p style="margin-left: 8"align=left><font face=Tahoma size=2> SIP and its associated protocols were designed to allow for changes that will permit new communication services and enhanced systems integration. To enhance the capabilities of SIP systems, the basic SIP protocol can be extended through the use of protocol extensions and SIP development toolkits. Some of the key extensions for SIP include SIP for Instant Messaging and Presence Leveraging Extensions (SIMPLE). </font></p> <p style="margin-left: 8"align=left><font face=Tahoma size=2> The core SIP protocol was intentionally designed to be simple in its design and to allow for future extensibility. It is through this extensibility that many of the new SIP services and features are appearing. </font></p> <p style="margin-left: 8"align=left><font face=Tahoma size=2> Changes to SIP and supporting protocols are made by the Internet Engineering Task Force (IETF) SIP working group. Because the addition of new features and capabilities to SIP can potentially cause unexpected equipment operation results, the SIP working group extends the protocol when there is significant documented reasons to extend the protocol. </font></p> <h2 style="margin-left: 8"align=left><font face=Tahoma size=3> SIP Extensions </font></h2> <p style="margin-left: 8"align=left><font face=Tahoma size=2> SIP Extensions are a set of commands or protocols that are used to <b> extend the capabilities of the core SIP protocol </b> . SIP extensions are commonly used to rapidly extend the capabilities of an existing application or protocol without changing the underlying application or protocol. </font></p> <p style="margin-left: 8"align=left><font face=Tahoma size=2> This figure shows how SIP extensions can be used to enhance the capabilities of the SIP core protocol and how they interact with the existing core protocol. This diagram shows that SIP extensions are used to process new types of messages that are sent on the SIP system. When core messages are sent between the SIP devices (such as between proxy servers), they are processed for the function defined in the standard. If a new type of message is received, the SIP device will determine if the message is associated with a SIP extension that is has installed. This diagram shows that the message processed by the SIP extension may interact with the core protocol and other SIP extensions. </font></p> <p align=center class=MsoNormal><font face=Tahoma size=2> <img alt="SIP Protocol Extention Option Diagram"border=0 height=171 src=http://www.althos.com/sample_diagrams/ag_SIP_Extensions_low_res.jpg width=468> </font></p> <font face=Tahoma size=2> <p style="margin-left: 8; margin-top: 10"align=center>SIP Extensions Diagram</p> </font> <h2 style="margin-left: 7"><font face=Tahoma size=2> <img border=0 height=12 src=http://www.wirelessdictionary.com/images/go.gif width=12> <font size=4>    </font> </font> <font face=Tahoma size=4> Related Session Initiation Protocol - SIP Terms </font></h2> <font face=Tahoma size=2> <p style="line-height: 150%; margin-left: 8"><a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Access-Control-List-ACL-Definition.html> Access Control List - ACL </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Access-Gateway-AGW-Definition.html> Access Gateway - AGW </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Access-Router-Card-ARC-Definition.html> Access Router Card - ARC </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Adaptive-Jitter-Buffer-Definition.html> Adaptive Jitter Buffer </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Analog-Telephone-Adapter-ATA-Definition.html> Analog Telephone Adapter - ATA </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Application-Server-AS-Definition.html> Application Server - AS </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Automatic-Discovery-Auto-Discovery-Definition.html> Automatic Discovery - Auto Discovery </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Call-Agent-CA-Definition.html> Call Agent </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Call-Server-Definition.html> Call Servers </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Central-Office-CO-Definition.html> Central Office - CO </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Click-to-Dial-or-Click-to-Call-Definition.html> Click to Dial or Click to Call </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Coder-Decoder-Codec-Definition.html> Coder/Decoder - Codec </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Communication-Server-Definition.html> Communication Server </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Communications-Assistance-For-Law-Enforcement-CALEA-Definition.html> Communications Assistance For Law Enforcement - CALEA </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Competitive-Local-Exchange-Carrier-CLEC-Definition.html> Competitive Local Exchange Carrier - CLEC </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Conference-Bridge-Definition.html> Conference Bridge </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Connected-State-Definition.html> Connected State </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Country-Code-Definition.html> Country Code </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Dial-Map-Definition.html> Dial Map </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Dial-Plan-Definition.html> Dial Plan </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Dialed-Number-Identification-Service-DNIS-Definition.html> Dialed Number Identification Service - DNIS </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Direct-Inward-Dialing-DID-Definition.html> Direct Inward Dialing - DID </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Direct-Station-Select-DSS-Definition.html> Direct Station Select - DSS </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Dynamic-Call-Routing-Definition.html> Dynamic Call Routing </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Dynamic-Host-Configuration-Protocol-DHCP-Definition.html> Dynamic Host Configuration Protocol - DHCP </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Dynamic-IP-Addressing-Definition.html> Dynamic IP Addressing </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Dynamic-Traffic-Routing-Definition.html> Dynamic Traffic Routing </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-End-User-Device-Definition.html> End User Devices - User Agents </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Equipment-Configuration-Definition.html> Equipment Configuration </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Ethernet-IP-Phone-Definition.html> Ethernet IP Phone </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Find-Me-Service-Definition.html> Find Me Service </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Foreign-Exchange-Office-FXO-Definition.html> Foreign Exchange Office - FXO </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Foreign-Exchange-Station-FXS-Definition.html> Foreign Exchange Station - FXS </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Forking-Proxy-Server-Definition.html> Forking Proxy Server </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Forwarding-Delay-Definition.html> Forwarding Delay </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Fragmentation-Definition.html> Fragmentation </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-G-711-Definition.html> G.711 </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-G-723-1-Definition.html> G.723.1 </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-G-729-Definition.html> G.729 </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Gateway-GW-Definition.html> Gateway - GW </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-General-Switched-Telephone-Network-GSTN-Definition.html> General Switched Telephone Network - GSTN </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Hosted-Telephony-Definition.html> Hosted Telephony </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Interexchange-Carrier-IXC-Definition.html> Interexchange Carrier - IXC </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-International-Toll-Free-Service-ITFS-Definition.html> International Toll Free Service - ITFS </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Internet-Phone-IPhone-Definition.html> Internet Phone - IPhone </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Internet-Protocol-Detail-Record-IPDR-Definition.html> Internet Protocol Detail Record - IPDR </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Internet-Protocol-Phone-IP-Phone-Definition.html> Internet Protocol Phone - IP Phone </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Internet-Protocol-Private-Branch-Exchange-IPBX-or-IP-PBX-Definition.html> Internet Protocol Private Branch Exchange - IPBX or IP PBX </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Internet-Telephony-Service-Provider-ITSP-Definition.html> Internet Telephony Service Provider - ITSP </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-IP-Enabled-PBX-Definition.html> IP Enabled PBX </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Key-Service-Unit-KSU-Definition.html> Key Service Unit - KSU </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Location-Server-LS-Definition.html> Location Servers - LS </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Mailbox-MBX-Definition.html> Mailbox - MBX </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Message-Waiting-Indicator-MWI-Definition.html> Message Waiting Indicator - MWI </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Network-Address-Translation-NAT-Definition.html> Network Address Translation - NAT </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Network-Operations-Center-NOC-Definition.html> Network Operations Center - NOC </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Policy-Server-Definition.html> Policy Server </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Presence-Server-Definition.html> Presence Server </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Presence-User-Agent-PUA-Definition.html> Presence User Agent - PUA </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Presentity-Presence-Entity-Definition.html> Presentity - Presence Entity </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Protocol-Extension-Definition.html> Protocol Extension </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Proxy-Server-Definition.html> Proxy Servers </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Quality-Of-Service-QoS-Definition.html> Quality Of Service - QoS </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Real-Time-Transport-Protocol-RTP-Definition.html> Real Time Transport Protocol - RTP </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Redirection-Server-Redirect-Server-Definition.html> Redirection Servers </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Registrar-Server-Definition.html> Registrars </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Residential-Gateway-RG-Definition.html> Residential Gateway - RG </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Route-Update-Protocol-RU-Definition.html> Route Update Protocol - RU </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Scheduling-Algorithm-Definition.html> Scheduling Algorithm </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Secure-Server-Definition.html> Secure Server </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Secure-Sockets-Layer-SSL-Definition.html> Secure Sockets Layer - SSL </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Sequenced-Packet-Protocol-SPP-Definition.html> Sequenced Packet Protocol - SPP </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Service-Activation-Definition.html> Service Activation </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Service-Level-Agreement-SLA-Definition.html> Service Level Agreement - SLA </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Service-Provider-Portability-Definition.html> Service Provider Portability </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Service-Requirements-Definition.html> Service Requirements </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Services-URL-Definition.html> Services URL </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Servlet-Definition.html> Servlet </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Session-Definition.html> Session </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Session-Border-Controller-SBC-Definition.html> Session Border Controller - SBC </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Session-Configuration-Protocol-SCP-Definition.html> Session Configuration Protocol - SCP </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Session-Description-Protocol-Next-Generation-SDPng-Definition.html> Session Description Protocol Next Generation - SDPng </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Session-Initiation-Protocol-SIP-Definition.html> Session Initiation Protocol - SIP </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Session-Layer-Definition.html> Session Layer </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Session-Management-Protocol-SMP-Definition.html> Session Management Protocol - SMP </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Signaling-Network-Definition.html> Signaling Network </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Signaling-Protocol-Definition.html> Signaling Protocol </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-SIP-for-Instant-Messaging-and-Presence-Leveraging-Extensions-SIMPLE-Definition.html> SIP for Instant Messaging and Presence Leveraging Extensions - SIMPLE </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-SIP-Info-Definition.html> SIP Info </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-SIP-T-Definition.html> SIP-T </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-SNMP-Trap-Definition.html> SNMP Trap </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Soft-Switch-Softswitch-Definition.html> Soft Switch - Softswitch </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Softphone-Definition.html> Softphone </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Static-IP-Addressing-Definition.html> Static IP Addressing </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Stream-Protocol-Definition.html> Stream Protocol </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Streaming-Definition.html> Streaming </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Streaming-Media-Definition.html> Streaming Media </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Streaming-Protocol-Definition.html> Streaming Protocol </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Streaming-Services-Definition.html> Streaming Services </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Subnet-Definition.html> Subnet </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Switching-Definition.html> Switching </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-T1-Carrier-T-1-Definition.html> T1 Carrier - T-1 </a> <br> <a style="text-decoration: none"href=http://www.voipdictionary.com/IPTelephonyDictionary-Telephony-Definition.html> Telephony </a> <br>  </p> </font> <p style="line-height: 150%; margin-left: 8"><font face=Tahoma size=2> <img border=0 height=12 src=http://www.wirelessdictionary.com/images/go.gif width=12> <font size=4>    </font> </font> <font face=Tahoma size=4> Session Initiation Protocol - SIP </font> <font face=Tahoma size=2> <font size=4> Books </font> </font></p> <table border=0 cellpadding=0 cellspacing=0 width=462><tbody><tr><td class=vr height=104 width=96><div align=center><a href=http://www.althosbooks.com/intowebafma.html> <img alt="Introduction to Cable Television (CATV) Book"align=center border=0 height=101 hspace=0 src=http://www.althos.com/presskits/0972805389/eB_Introduction_to_SIP_cover_web_small.jpg vspace=0 width=79> </a></div> <p align=center><font face="arial, helvetica"size=1> <a href=http://www.althosbooks.com/intowebafma.html> more details </a> </font></p><td height=104 valign=top width=315><p class=MsoNormal><font face="arial, helvetica"color=#FF0000 size=2> <b> Introduction to SIP IP Telephony Systems) </b> </font></p> <p><font face=Tahoma size=1> <span style="mso-bidi-font-size: 10.0pt; mso-fareast-font-family: Times New Roman; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"> This book explains why people and companies are using SIP equipment and software to efficiently upgrade existing telephone systems, develop their own advanced communications services, and to more easily integrate telephone network with company information systems. This book also provides descriptions of the function parts of SIP systems and operations. </span> </font></p> <font face=Tahoma size=2> </font> <p style="line-height: 100%"><font face=Tahoma size=2> <b> <font color=#FF0000 face=Tahoma size=1> $1 </font> </b> </font> <b> <font color=#FF0000 face=Tahoma size=1> 9.99 Printed, $16.99 eBook </font> </b></p></table> <font face=Tahoma size=2> <table border=0 cellpadding=0 cellspacing=0 height=40 width=463><tbody><tr><td colspan=3 height=21 width=461><p align=center><script><!--
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