CT SIP Stack The CentralTouch SIP Stack comprises the set of classes used to develop managed application for IP Communication services such as Telephony and Presence Awareness. These are implemented on MS .Net. The namespace CT.Protocol.SIP includes all the classes that implement the concept and behavior defined for Session Initiation Protocol (SIP) and Session Description Protocol, including:    CT.Protocol.Transport: SIPTransaction and Transport Layer (TCP and UDP) CT.Protocol.SIP.Address: SIP Addresses CT.Protocol.SIP.Message: SIP request and response messages CT.Protocol.SIP.SIPHeaders: SIP Headers CT.Protocol.SIP.SDP: Session Description Protocol(SDP) CT.Protocol.SIP.Proxy: SIP Proxy function Etc. For more information please contact CentralTouch