SIP Line
   SIP Line Cisco Extensions Overview.pdf
  Overview of Cisco extensions to the standard SIP protocol
   SIP Line Messaging Guide v5.0(4).pdf
  Details and specifications for using SIP Line side protocol - v5.0(4)
   SIP Line Messaging Guide v5.1(1).pdf
  Details and specifications for using SIP Line side protocol - v5.1(1)
   SIP Line Messaging Guide v6.0(1).pdf
  Details and specifications for using SIP Line side protocol - v6.0(1)
   SIP Line Messaging Guide v7.0(1).pdf
  Details and specifications for using SIP Line side protocol - v7.0(1)
   SIP Line Messaging Guide v7.1(3).pdf
  Details and specifications for using SIP Line side protocol - v7.0(1)
   SIP Line Messaging Guide v8.0(1).pdf
  Details and specifications for using SIP Line side protocol - v8.0(1)
   SIP Line Messaging Guide v8.5(1).pdf
  Details and specifications for using SIP Line side protocol - v8.5(1)
SIP Trunk
   Cisco Unified CM Silent Monitoring & Recording Overview.ppt
  Overview of Cisco Unified CM phone-based media forking, usage, call flows, and supported Partner integrations. Updated: Mar 2011
   Cisco Unified CM Silent Monitoring & Recording Specification.pdf
  Functional specification for silent call monitoring and recording. *ACCESS REQUIRES* User login associated to Cisco Developer Services contract. Updated September 2010.
   Configure Outlook to receive Blog Messages.pdf
  Illustrates how to configure Microsoft Outlook to automatically receive Cisco Developer Network Blog messages, announcements, and alerts.
   SIP Trunk Messaging Guide (Extended) v6.0(1).pdf
  *ACCESS REQUIRES* User login associated to Cisco Developer Services contract
   SIP Trunk Messaging Guide (Extended) v7.0(1).pdf
  *ACCESS REQUIRES* User login associated to Cisco Developer Services contract
   SIP Trunk Messaging Guide (Extended) v7.1(2).pdf
  *ACCESS REQUIRES* User login associated to Cisco Developer Services contract
   SIP Trunk Messaging Guide (Extended) v8.0(1).pdf
  *ACCESS REQUIRES* User login associated to Cisco Developer Services contract
   SIP Trunk Messaging Guide (Extended) v8.5(1).pdf
  *ACCESS REQUIRES* User login associated to Cisco Developer Services contract
   SIP Trunk Messaging Guide v5.0(4).pdf
  Description and specification of the SIP Trunk interface - v5.0(4)
   SIP Trunk Messaging Guide v6.0(1).pdf
  Description and specification of the SIP Trunk interface - v6.0(1)
   SIP Trunk Messaging Guide v7.0(1).pdf
  Description and specification of the SIP Trunk interface - v7.0(1)
   SIP Trunk Messaging Guide v7.1(2).pdf
  Description and specification of the SIP Trunk interface - v7.0(1)
   SIP Trunk Messaging Guide v8.0(1).pdf
  Description and specification of the SIP Trunk interface - v8.0(1)
   SIP Trunk Messaging Guide v8.5(1).pdf
  Description and specification of the SIP Trunk interface - v8.5(1)
SIP Transparency and Normalization
   8.5(1) Developer Guide for SIP Transparency and Normalization.pdf
  SIP T&N feature overview, Lua scripting developer guide and reference, sample code