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Session Description Protocol

SIP

4

SIP Session Description Protocol, SDP.

Merion Academy


Asterisk

SDP 1998 RFC2327. 8 , 2006 , RFC4566.

SDP . IP , . ?

SDP

SDP SIP . . SIP INVITE, IP Asterisk sngrep:

INVITE sip:74996491913@192.168.x.xxx:5061;transport=UDP SIP/2.0
Via: SIP/2.0/UDP 80.xx.yy.zz:5060;branch=z9hG4bK-524287-1-MThkZjMzNzMyXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX;rport
Via: SIP/2.0/UDP 80.xx.yy.zz:5077;branch=z9hG4bK-XXXXXXXXXXXXXXXX;rport=5077
Max-Forwards: 69
Record-Route: <sip:80.xx.yy.zz:5060;lr;transport=UDP>
Contact: <sip:80.xx.yy.zz:5077>
To: <sip:74996491913@80.xx.yy.zz>
From: <sip:7925XXXXXXX@80.xx.yy.zz>;tag=qdpxhe2avyyjcqfn.o
Call-ID: fb9909e8fYYYYYYYYYYYYYYYYYYYYYY
CSeq: 479 INVITE
Expires: 300
Allow: INVITE, ACK, BYE, CANCEL, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS, UPDATE
Content-Disposition: session
Content-Type: application/sdp
User-Agent: Sippy
P-Asserted-Identity: <sip:7925XXXXXXX@80.xx.yy.zz>
Remote-Party-ID: <sip:7925XXXXXXX@80.xx.yy.zz>;party=calling
h323-conf-id: 4133864240-4217115111-2706418710-XXXXXXXXX
Portasip-3264-action: offer 1
cisco-GUID: 4133864240-4217115111-2706418710-XXXXXXXXX
Content-Length: 278

v=0
o=Sippy 1011212504475793896 1 IN IP4 80.xx.yy.zz
s=-
c=IN IP4 80.xx.yy.zz
t=0 0
m=audio 57028 RTP/AVP 0 8 18 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=yes
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
Session Description Protocol

, SIP SDP . , Content-Type, SDP .

SDP

SDP :

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. : <> = <>. 1 .
v= v=0
o= o=<_> <_> <> <_> <_> <>.
o=Sippy 1011212504475793896 1 IN IP4 80.xx.yy.zz (IN - , , IP4 - , IPv4;
s= ("-"), ;
c= ; : c=<_> <_> <>. IN IP4 80.xx.yy.zz. IN/IP4 .
t= : t=<_> <_>. , , , . t=0 0
m= , m=<_> <> <> <_>. - m=audio 57028 RTP/AVP 0 8 18 101, ( video, ), 57028, , RTP/AVP, RTP Audio and Video Conferences with Minimal Control, RFC3551. , 0 G.711 uLaw, 8 G.711 ALaw, 18 G.729. , G.711 uLaw, G.711 ALaw, G.729. 101 , DTMF.
a= a=<> a=<><>. SDP . .

, k=, , i=, . a=:
rtpmap a=rtpmap:<> <_>/<_> [/<_>].
, , m=. , a=rtpmap:0 PCMU/8000, G.711 - U - 8000 .
sendrecv
a=sendrecv , - . , (sendonly), (recvonly) (inactive);
ptime a=ptime:<_>
RTP - ( ). , RTP - ;
fmtp a=fmtp:<> <_>
, , (VAD) ;

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