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任何人都可以給我一些純粹的Insight如何創建多部分sdp以及此給定SDP的all屬性的含義是什麼。瞭解具有MIME的Lync客戶端多部分SDP
Content-Type: multipart/alternative;boundary="----=_NextPart_000_001B_01CDC5AC.EC1E2DE0"
ms-routing-phase:from-uri-routing-done
------=_NextPart_000_001B_01CDC5AC.EC1E2DE0
Content-Type: application/sdp
Content-Transfer-Encoding: 7bit
Content-ID: <[email protected]>
Content-Dis; handling=optional; ms-proxy-2007fallback
v=0
o=- 0 0 IN IP4 192.168.0.179
s=session
c=IN IP4 192.168.0.179
b=CT:99980
t=0 0
m=audio 19384 RTP/AVP 114 9 112 111 0 8 116 115 4 97 13 118 101
a=candidate:oKpwKDjMnfFmkSeXlIgoUEYW0BiriMilFQluFogmIQ8 1 XJoleCXuzzNJHAdN0G5MHg UDP 0.830 192.168.0.179 19384
a=candidate:oKpwKDjMnfFmkSeXlIgoUEYW0BiriMilFQluFogmIQ8 2 XJoleCXuzzNJHAdN0G5MHg UDP 0.830 192.168.0.179 19385
a=cryptoscale:1 client AES_CM_128_HMAC_SHA1_80 inline:28zhxoLlrww36J41bGxjePNf0ft/BbQkHXd2Pwf2|2^31|1:1
a=crypto:2 AES_CM_128_HMAC_SHA1_80 inline:EHIG0MBaCja1hyD1kJJvm3A8Ld8sIbCyeY26J5TI|2^31|1:1
a=crypto:3 AES_CM_128_HMAC_SHA1_80 inline:4y2YFeVNzH/rdIrbkSD+kMMFYP5OlccmnfBeELrW|2^31
a=maxptime:200
特別是a = candidate的加密值：，如何解密並創建它。
是否有任何文檔或rfc請指明。
謝謝。