EasyGBS的核心功能：
（1）提供用戶管理及Web可視化頁面管理；
（2）提供設備狀態管理，可實時查看設備是否掉線等信息；
（3）實時流媒體處理，PS（TS）轉ES；
（4）實時快照、視頻數據獲取；
（5）設備狀態監測；
（6）雲台控制；
（7）錄像檢索、回放；
（8）提供RTSP、RTMP、HTTP-FLV、HLS等多種協議流輸出；
（9）對外提供服務器獲取狀態、信息，控制等HTTP API接口；
GB28181點播下載注意點
在公安一所檢測的時候，國標GB28181視頻流媒體平台中，點播和下載有個不大不小的坑，一般點播和下載完成后，會有一個121的message通知消息，這個message並不是callid和invite一樣就可以了。下面我們列舉一個正確的信息，希望去檢測的朋友多注意一下。
INVITE sip:11011201001310019394@1101120100 SIP/2.0
Call-ID: a068a321fb7ee0208f1591fbdeeb2856@0.0.0.0
CSeq: 1 INVITE
From: <sip:11010000002000000003@1101000000>;tag=85975625_53173353_103e2a53-9100-45ea-ace2-32bfcbb7552b
To: <sip:11011201001310019394@1101120100>
Max-Forwards: 70
Contact: "11010000002000000003" <sip:11.254.2.50:5060>
Subject: 11011201001310019394:1-4-1515477228061,11010000002000000003:1
Content-Type: application/sdp
Route: <sip:11011201001310019394@11.30.80.53:7100;lr>
Via: SIP/2.0/UDP 11.254.2.50:5060;branch=z9hG4bK103e2a53-9100-45ea-ace2-32bfcbb7552b_53173353_218274686212296
Content-Length: 270
v=0
o=11010000002020000003 0 0 IN IP4 11.254.2.50
s=Download
u=11011201001310019394:3
c=IN IP4 11.254.2.50
t=1515435056 1515435236
m=video 9910 RTP/AVP 96 98 97
a=recvonly
a=rtpmap:96 PS/90000
a=rtpmap:97 MPEG4/90000
a=rtpmap:98 H264/90000
a=downloadspeed:1
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 11.254.2.50:5060;branch=z9hG4bK103e2a53-9100-45ea-ace2-32bfcbb7552b_53173353_218274686212296
From: <sip:11010000002000000003@1101000000>;tag=85975625_53173353_103e2a53-9100-45ea-ace2-32bfcbb7552b
To: <sip:11011201001310019394@1101120100>
Call-ID: a068a321fb7ee0208f1591fbdeeb2856@0.0.0.0
CSeq: 1 INVITE
User-Agent: NCG V2.6.4.457271
Content-Length: 0
SIP/2.0 200 OK
Via: SIP/2.0/UDP 11.254.2.50:5060;branch=z9hG4bK103e2a53-9100-45ea-ace2-32bfcbb7552b_53173353_218274686212296
From: <sip:11010000002000000003@1101000000>;tag=85975625_53173353_103e2a53-9100-45ea-ace2-32bfcbb7552b
To: <sip:11011201001310019394@1101120100>;tag=77643965
Call-ID: a068a321fb7ee0208f1591fbdeeb2856@0.0.0.0
CSeq: 1 INVITE
Contact: <sip:11011204002001000001@11.30.80.53:7100>
Content-Type: Application/SDP
User-Agent: NCG V2.6.4.457271
Content-Length: 204
v=0
o=11011201001310019394 0 0 IN IP4 11.254.2.50
s=Download
c=IN IP4 11.30.80.53
t=1515435056 1515435236
m=video 5134 RTP/AVP 96
a=rtpmap:96 PS/90000
a=sendonly
a=filesize:46240920
y=1100000018
ACK sip:11011204002001000001@11.30.80.53:7100 SIP/2.0
Call-ID: a068a321fb7ee0208f1591fbdeeb2856@0.0.0.0
CSeq: 1 ACK
From: <sip:11010000002000000003@1101000000>;tag=85975625_53173353_103e2a53-9100-45ea-ace2-32bfcbb7552b
To: <sip:11011201001310019394@1101120100>;tag=77643965
Max-Forwards: 70
Via: SIP/2.0/UDP 11.254.2.50:5060;branch=z9hG4bK103e2a53-9100-45ea-ace2-32bfcbb7552b_53173353_218277296041838
Content-Length: 0
MESSAGE sip:11.254.2.50:5060 SIP/2.0
Via: SIP/2.0/UDP 11.30.80.53:7100;rport;branch=z9hG4bK547055737
From: <sip:11011201001310019394@1101120100>;tag=77643965
To: <sip:11010000002000000003@1101000000>;tag=85975625_53173353_103e2a53-9100-45ea-ace2-32bfcbb7552b
Call-ID: a068a321fb7ee0208f1591fbdeeb2856@0.0.0.0
CSeq: 2 MESSAGE
Contact: <sip:11011201001310019394@11.30.80.53:7100>
Content-Type: Application/MANSCDP+xml
Max-Forwards: 70
User-Agent: NCG V2.6.4.457271
Content-Length: 164
<?xml version="1.0"?>
<Notify>
<CmdType>MediaStatus</CmdType>
<SN>10948</SN>
<DeviceID>11011201001310019394</DeviceID>
<NotifyType>121</NotifyType>
</Notify>
SIP/2.0 200 OK
CSeq: 2 MESSAGE
Call-ID: a068a321fb7ee0208f1591fbdeeb2856@0.0.0.0
From: <sip:11011201001310019394@1101120100>;tag=77643965
To: <sip:11010000002000000003@1101000000>;tag=85975625_53173353_103e2a53-9100-45ea-ace2-32bfcbb7552b
Via: SIP/2.0/UDP 11.30.80.53:7100;rport=7100;branch=z9hG4bK547055737;received=11.30.80.53
Content-Length: 0
BYE sip:11011204002001000001@11.30.80.53:7100 SIP/2.0
CSeq: 2 BYE
From: <sip:11010000002000000003@1101000000>;tag=85975625_53173353_103e2a53-9100-45ea-ace2-32bfcbb7552b
To: <sip:11011201001310019394@1101120100>;tag=77643965
Call-ID: a068a321fb7ee0208f1591fbdeeb2856@0.0.0.0
Max-Forwards: 70
Via: SIP/2.0/UDP 11.254.2.50:5060;branch=z9hG4bK103e2a53-9100-45ea-ace2-32bfcbb7552b_53173353_218279714192785
Content-Length: 0
SIP/2.0 200 OK
Via: SIP/2.0/UDP 11.254.2.50:5060;branch=z9hG4bK103e2a53-9100-45ea-ace2-32bfcbb7552b_53173353_218279714192785
From: <sip:11010000002000000003@1101000000>;tag=85975625_53173353_103e2a53-9100-45ea-ace2-32bfcbb7552b
To: <sip:11011201001310019394@1101120100>;tag=77643965
Call-ID: a068a321fb7ee0208f1591fbdeeb2856@0.0.0.0
CSeq: 2 BYE
User-Agent: NCG V2.6.4.457271
Content-Length: 0
特別要注意message的from 和 to 是回復客戶端200OK的from和to相反的信息（包括tag信息）
下面列舉下28181檢測截圖：
