GB28181流媒体服务器发展目标
GB28181流媒体服务器已经实现了GB28181协议，能够接入各个厂家的监控设备和监控平台，实现统一管理，和web端无插件播放，同时支持手机、微信、网页播放。
今天我们来讲一下国标GB28181里面的移动位置订阅。移动位置订阅是国标28181-2016版本新出的协议，协议里面对移动位置订阅的描述不是很清晰，因此我们在这边简单规整一下，也简单说明一下移动订阅的流程。
移动订阅的流程
1、订阅和取消订阅流程
移动位置订阅的包体信息：
<?xml version="1.0"?>
<Query>
<CmdType>MobilePosition</CmdType>
<SN>51</SN>
<DeviceID>64000000001310000001</DeviceID>
<Interval>6</Interval>
</Query>
移动位置取消订阅的包体信息：
<?xml version="1.0"?>
<Query>
<CmdType>MobilePosition</CmdType>
<SN>7</SN>
<DeviceID>64000000001310000001</DeviceID>
</Query>
2、移动位置通知流程
移动位置通知消息，包体内容：
<?xml version="1.0" ?>
<Notify>
<DeviceID>64000000001310000001</DeviceID>
<CmdType>MobilePosition</CmdType>
<SN>128</SN>
<Time>2017-05-19T10:27:58</Time>
<Longitude>116.336</Longitude>
<Latitude>39.942</Latitude>
<Speed>0.0</Speed>
<Direction>0.0</Direction>
<Altitude>0.0</Altitude>
</Notify>
下面简单粘贴下抓包的信息
移动位置订阅消息：
SUBSCRIBE sip:64000000001310000001@192.168.1.93:5060 SIP/2.0
Call-ID: 4ef921da0c61d38df35ed9794b79e6fd@0.0.0.0
CSeq: 1 SUBSCRIBE
From: <sip:34020000002000000001@3402000000>;tag=98909488_53173353_53a5809f-9432-4c74-b2f3-1b0d496fc3db
To: <sip:64000000001310000001@192.168.1.93:5060>
Max-Forwards: 70
Contact: "34020000002000000001" <sip:192.168.1.81:5060>
Expires: 600
Event: Catalog;id=55
Content-Type: Application/MANSCDP+xml
Via: SIP/2.0/UDP 192.168.1.81:5060;branch=z9hG4bK53a5809f-9432-4c74-b2f3-1b0d496fc3db_53173353_7382400244196
Content-Length: 157
<?xml version="1.0"?>
<Query>
<CmdType>MobilePosition</CmdType>
<SN>51</SN>
<DeviceID>64000000001310000001</DeviceID>
<Interval>6</Interval>
</Query>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.1.81:5060;branch=z9hG4bK53a5809f-9432-4c74-b2f3-1b0d496fc3db_53173353_7382400244196
From: <sip:34020000002000000001@3402000000>;tag=98909488_53173353_53a5809f-9432-4c74-b2f3-1b0d496fc3db
To: <sip:64000000001310000001@192.168.1.93:5060>;tag=waUyeIgW
Call-ID: 4ef921da0c61d38df35ed9794b79e6fd@0.0.0.0
CSeq: 1 SUBSCRIBE
Contact: <sip:64000000001310000001@192.168.1.93:5060>
Expires: 600
Content-Length: 0
移动位置上报的抓包信息（由于检测的时候设备还没有设备厂商过了GB28181-2016检测，还是采用的定制海康的设备，包体内容还有些小bug给*一所说了，后面有所修改）:
NOTIFY sip:34020000002000000001@3402000000 SIP/2.0
Via: SIP/2.0/UDP 192.168.1.93:5060;rport;branch=z9hG4bK-3d09000-17478ee-Hi8M6Ajh
From: <sip:64000000001310000001@192.168.1.93:5060>;tag=waUyeIgW
To: <sip:34020000002000000001@3402000000>;tag=98909488_53173353_53a5809f-9432-4c74-b2f3-1b0d496fc3db
Call-ID: 4ef921da0c61d38df35ed9794b79e6fd@0.0.0.0
CSeq: 2 NOTIFY
Contact: <sip:192.168.1.93:5060>
Content-Type: Application/MANSCDP+xml
Max-Forwards: 70
Event: Catalog;id=55
Subscription-State: active
Content-Length: 310
<?xml version="1.0" encoding="UTF-8"?>
<Notify>
<DeviceID>64000000001310000001</DeviceID>
<CmdType>MobilePosition</CmdType>
<SN>126</SN>
<Time>2017-05-19T10:27:38</Time>
<Longitude>116.336</Longitude>
<Latitude>39.942</Latitude>
<Speed>0.0</Speed>
<Direction>0.0</Direction>
<Altitude>0.0</Altitude>
</Notify>
SIP/2.0 200 OK
To: <sip:34020000002000000001@3402000000>;tag=98909488_53173353_53a5809f-9432-4c74-b2f3-1b0d496fc3db
Via: SIP/2.0/UDP 192.168.1.93:5060;rport=5060;branch=z9hG4bK-3d09000-17478ee-Hi8M6Ajh;received=192.168.1.93
CSeq: 2 NOTIFY
Call-ID: 4ef921da0c61d38df35ed9794b79e6fd@0.0.0.0
From: <sip:64000000001310000001@192.168.1.93:5060>;tag=waUyeIgW
Contact: <sip:192.168.1.81:5060>
Content-Length: 0
移动位置取消订阅：
SUBSCRIBE sip:192.168.1.93:5060 SIP/2.0
CSeq: 2 SUBSCRIBE
From: <sip:34020000002000000001@3402000000>;tag=98909488_53173353_53a5809f-9432-4c74-b2f3-1b0d496fc3db
To: <sip:64000000001310000001@192.168.1.93:5060>;tag=waUyeIgW
Call-ID: 4ef921da0c61d38df35ed9794b79e6fd@0.0.0.0
Max-Forwards: 70
Contact: <sip:192.168.1.81:5060>
Expires: 0
Event: Catalog;id=55
Content-Type: Application/MANSCDP+xml
Via: SIP/2.0/UDP 192.168.1.81:5060;branch=z9hG4bK53a5809f-9432-4c74-b2f3-1b0d496fc3db_53173353_7422092422952
Content-Length: 150
<?xml version="1.0"?>
<Query>
<CmdType>MobilePosition</CmdType>
<SN>55</SN>
<DeviceID>64000000001310000001</DeviceID>
</Query>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.1.81:5060;branch=z9hG4bK53a5809f-9432-4c74-b2f3-1b0d496fc3db_53173353_7422092422952
From: <sip:34020000002000000001@3402000000>;tag=98909488_53173353_53a5809f-9432-4c74-b2f3-1b0d496fc3db
To: <sip:64000000001310000001@192.168.1.93:5060>;tag=waUyeIgW
Call-ID: 4ef921da0c61d38df35ed9794b79e6fd@0.0.0.0
CSeq: 2 SUBSCRIBE
Contact: <sip:64000000001310000001@192.168.1.93:5060>
Expires: 600
Content-Length: 0
下面附注一下检测的结果：
