<Ul> <Li> Session Initiation Protocol (SIP), connection management protocol developed by the IETF </Li> <Li> H. 323, one of the first VoIP call signaling and control protocols that found widespread implementation . Since the development of newer, less complex protocols such as MGCP and SIP, H. 323 deployments are increasingly limited to carrying existing long - haul network traffic . </Li> <Li> Media Gateway Control Protocol (MGCP), connection management for media gateways </Li> <Li> H. 248, control protocol for media gateways across a converged internetwork consisting of the traditional public switched telephone network (PSTN) and modern packet networks </Li> <Li> Real - time Transport Protocol (RTP), transport protocol for real - time audio and video data </Li> <Li> Real - time Transport Control Protocol (RTCP), sister protocol for RTP providing stream statistics and status information </Li> <Li> Secure Real - time Transport Protocol (SRTP), encrypted version of RTP </Li> <Li> Session Description Protocol (SDP), file format used principally by SIP to describe VoIP connections </Li> <Li> Inter-Asterisk eXchange (IAX), protocol used between VoIP servers </Li> <Li> XMPP, instant messaging, presence information, and contact list maintenance </Li> <Li> Jingle, adds peer - to - peer session control to XMPP </Li> <Li> Skype protocol, proprietary Internet telephony protocol suite based on peer - to - peer architecture </Li> </Ul> <Li> Session Initiation Protocol (SIP), connection management protocol developed by the IETF </Li> <Li> H. 323, one of the first VoIP call signaling and control protocols that found widespread implementation . Since the development of newer, less complex protocols such as MGCP and SIP, H. 323 deployments are increasingly limited to carrying existing long - haul network traffic . </Li> <Li> Media Gateway Control Protocol (MGCP), connection management for media gateways </Li>

​in a voip call what method of transmission is used between two ip phones