---

---

Session description
v= (protocol version)
o= (owner/creator and session identifier)
u=* (URI of description)
e=* (email address)
a=* (zero or more session attribute lines)
i=* (session information)


Time description
t= (time the session is active)

Media description
m= (media name and transport address)

---

Posted by sagitraz

v= SDP version (currently 0)
o= owner and session identifier (Not needed if Call-ID is enough)
a= Attributes. You can define a number of types of attributes. “SIP” defines what kind of attribute.
i= Information about the session. Subject Line
u= URL containing a description of the session
e= E-mail address to obtain more information about the session
t= Time when the session is active (Optional with SIP)
m= Media Line. M=
a = Attribute (of media)
a=rtmap: 4 GSM /8000 means: rtpmap= profile type. 4=profile number. GSM= codec /8000= samples per second
a=audio 4006 rtp/avp 0 4: means .audio = profile type. 4006 = port. rtp/avp = transport protocol 0 4= list of profiles

---

Posted by snjysanjay05