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Internet protocol suite

5. Application layer

DNS, TLS/SSL, TFTP, FTP, HTTP, IMAP4, IRC, MIME, POP3, SIP, SMTP, SNMP, SSH, TELNET, RTP, SDP, …

4. Transport layer

TCP, UDP, RSVP, DCCP, SCTP, …

3. Network layer

IP (IPv4, IPv6), ICMP, IGMP, ARP, RARP, …

2. Data link layer

Ethernet, Wi-Fi, PPP, FDDI, ATM, Frame Relay, GPRS, Bluetooth, …

1. Physical layer

Modems, ISDN, SONET/SDH, RS232, USB, Ethernet physical layer, Wi-Fi, GSM, Bluetooth, … edit

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fr:Modèle:Pile de protocoles pt:Predefinição:ProtocolosIP vi:Tiêu bản:IPstack

Session Description Protocol (SDP), is a format for describing streaming media initialization parameters. It has been published by the IETF as RFC 4566. <ref>RFC 4566, SDP: Session Description Protocol, July 2006.</ref>

SDP is intended for describing multimedia sessions for the purposes of session announcement, session invitation, and other forms of multimedia session initiation.

SDP started off as a component of the Session Announcement Protocol (SAP), but found other uses in conjunction with RTP, SIP and just as a standalone format for describing multicast sessions.

There are five terms related to SDP:

1. Conference: It is a set of two or more communicating users along with the software they are using.
2. Session : Session is the multimedia sender and receiver and the flowing stream of data.
3. Session Announcement: A session announcement is a mechanism by which a session description is conveyed to users in a proactive fashion, i.e., the session description was not explicitly requested by the user.
4. Session Advertisement : same as session announcement
5. Session Description : A well defined format for conveying sufficient information to discover and participate in a multimedia session.

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