Which protocol is designed to initiate, maintain, and terminate real-time sessions including voice, video, and messaging?

Which protocol is designed to initiate, maintain, and terminate real-time sessions including voice, video, and messaging?

• A. Session Initiation Protocol
• B. Lightweight Directory Access Protocol
• C. Simple Network Management Protocol
• D. Dynamic Host Configuration Protocol

Answer: (A)

The signaling used to start, manage, and end real-time sessions like voice, video, and messaging is Session Initiation Protocol. It provides the control messages that set up who is involved, negotiate the media parameters, keep the session alive, and terminate it when done. In practice, SIP handles actions such as inviting participants, acknowledging the invitation, modifying or holding a session, and ending it with a BYE message. It works alongside media protocols (often using RTP for the actual audio/video packets) and uses descriptions (via SDP) to agree on codecs, formats, and transport details. The protocol relies on elements like proxies and registrars to route invitations and manage user presence, making it the signaling foundation for real-time communication sessions. By contrast, the other protocols serve different roles: LDAP is for directory access, SNMP for network management, and DHCP for assigning IP configuration.

The signaling used to start, manage, and end real-time sessions like voice, video, and messaging is Session Initiation Protocol. It provides the control messages that set up who is involved, negotiate the media parameters, keep the session alive, and terminate it when done. In practice, SIP handles actions such as inviting participants, acknowledging the invitation, modifying or holding a session, and ending it with a BYE message. It works alongside media protocols (often using RTP for the actual audio/video packets) and uses descriptions (via SDP) to agree on codecs, formats, and transport details. The protocol relies on elements like proxies and registrars to route invitations and manage user presence, making it the signaling foundation for real-time communication sessions. By contrast, the other protocols serve different roles: LDAP is for directory access, SNMP for network management, and DHCP for assigning IP configuration.