國標gb28181在做內網穿透時遇到的一些問題
同某個廠家的攝像頭做國標gb28181的聯調,遇到一些問題這裡做一下記錄
情況是這樣子的,這次專案的特點是使用國標gb28181做為攝像機和平臺之間的通訊協議方式,並且平臺是上級在公網上,有一個公網ip,攝像頭是下級,在內網裡,要經過閘道器同公網上的平臺通訊。在我司和對方的廠家的內網裡都有測試用攝像頭,都能通到外網去。環境搭建好後將兩個地點的攝像頭向公網上的平臺註冊。
首先發現的問題是對方網路裡的攝像頭無法註冊成功,我方網路裡的攝像頭則可以成功。兩邊的配置資訊都是對的,後來發現該廠商的攝像頭在請求註冊時沒有在via里加上rport引數導致。
因為我們這個專案是內網到外網,再從外網到內網,有內網穿透的情況,內網對映到外網的埠會發生改變,所以要有一套機制來做穿透,因為國標是基於sip協議的,sip下做內網穿透的事rport機制,如果傳送的請求不帶rport標識就是不啟用這套機制,所以在外網到內網時會出問題。因為內網的頭在傳送資訊到公網上會經過一個閘道器,閘道器會使用nat協議轉換內網的埠,這個對映到公網上的埠可能和內網的一致,也有可能不一致!而剛好在我方的網路裡這個埠恰巧一致了!而對方的不一致。
公網上的平臺在收到攝像頭的註冊資訊裡因為沒有發現rport引數,在返回註冊響應時,直接使用請求裡的攝像頭內網埠資訊了,直接導致對方網路裡的攝像頭得不到註冊成功資訊,而我方因為剛好對映為了相同的埠,卻能收到註冊響應能註冊上。
如下是osip裡列印出的日誌,反應出了這個問題,收到的埠是17961,傳送時卻到了內網的39512上
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| INFO1 | 63978 <eXtl_udp.c: 452> Message received from: 113.118.241.57:17961
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| INFO1 | 63978 <udp.c: 1408> Received message len=500 from 113.118.241.57:17961:
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REGISTER sip:340200000020000000065@112.33.56.65:5066 SIP/2.0
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Via: SIP/2.0/UDP 192.168.1.200:39512;branch=z9hG4bKa5394e4c
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From: <sip:34020000001320000205@340200>;tag=5f7b2db0
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To: <sip:34020000001320000205@340200>
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Contact: <sip:34020000001320000205@192.168.1.200:39512>
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Call-ID: 023D9B1335824B31@192.168.1.200
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CSeq: 548 REGISTER
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Max-Forwards: 70
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Expires: 3600
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Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
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User-Agent: HTSIP AGENT 2.0
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Content-Length: 0
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| INFO3 | 63978 <udp.c: 1426> MESSAGE REC. CALLID:023D9B1335824B31
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| INFO1 | 63978 <udp.c: 1473> no transaction for message
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| INFO2 | 63978 <osip_transaction.c: 136> allocating transaction resource 45 023D9B1335824B31
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| INFO2 | 63978 <nist.c: 31> allocating NIST context
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| INFO4 | 63979 <osip_transaction.c: 349> sipevent tr->transactionid: 45
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| INFO4 | 63979 <osip_transaction.c: 350> sipevent tr->state: 15
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| INFO4 | 63979 <osip_transaction.c: 351> sipevent evt->type: 12
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| INFO4 | 63979 <osip_transaction.c: 352> sipevent evt->sip: c4033050
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| INFO3 | 63979 <jcallback.c: 358> cb_rcvregister (id=45)
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| INFO4 | 63979 <osip_transaction.c: 373> sipevent evt: method called!
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| INFO4 | 63980 <osip_transaction.c: 349> sipevent tr->transactionid: 45
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| INFO4 | 63980 <osip_transaction.c: 350> sipevent tr->state: 16
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| INFO4 | 63980 <osip_transaction.c: 351> sipevent evt->type: 20
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| INFO4 | 63980 <osip_transaction.c: 352> sipevent evt->sip: bc005f00
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| INFO2 | 63980 <eXutils.c: 755> DNS resolution with 113.118.241.57:39512
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| INFO2 | 63980 <eXutils.c: 779> getaddrinfo returned: 113.118.241.57 port 39512
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| INFO1 | 63980 <eXtl_udp.c: 779> Message sent: (to dest=113.118.241.57:39512)
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SIP/2.0 200 OK
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Via: SIP/2.0/UDP 192.168.1.200:39512;branch=z9hG4bKa5394e4c;received=113.118.241.57
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From: <sip:34020000001320000205@340200>;tag=5f7b2db0
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To: <sip:34020000001320000205@340200>;tag=1082451661
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Call-ID: 023D9B1335824B31@192.168.1.200
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CSeq: 548 REGISTER
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User-Agent: JUNTAI SIP UAS/1.0
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Date: 2019-06-29T21:52:10.001
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Expires: 3600
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Content-Length: 0
其次,在攝像頭取到流,關閉流傳送BYE時也存在問題,如下,在返回ack和bye時,找到的地址不對了,是內網的ip或地址去了
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| INFO1 | 369109 <jcallback.c: 1528> cb_sndreq_retransmission (id=133)
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| INFO4 | 369109 <osip_transaction.c: 373> sipevent evt: method called!
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| INFO2 | 369522 <osip_transaction.c: 136> allocating transaction resource 134 385231458
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| INFO2 | 369522 <ict.c: 32> allocating ICT context
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| INFO4 | 369522 <osip.c: 1456> 1 Pending event already in transaction !
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| INFO4 | 369522 <osip_transaction.c: 349> sipevent tr->transactionid: 134
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| INFO4 | 369522 <osip_transaction.c: 350> sipevent tr->state: 0
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| INFO4 | 369522 <osip_transaction.c: 351> sipevent evt->type: 16
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| INFO4 | 369522 <osip_transaction.c: 352> sipevent evt->sip: 8038f730
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| INFO2 | 369522 <eXutils.c: 755> DNS resolution with 113.118.241.57:18669
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| INFO2 | 369522 <eXutils.c: 779> getaddrinfo returned: 113.118.241.57 port 18669
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| INFO1 | 369522 <eXtl_udp.c: 779> Message sent: (to dest=113.118.241.57:18669)
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INVITE sip:34020000001320000205@113.118.241.57:18669 SIP/2.0
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Via: SIP/2.0/UDP 192.168.200.2:5066;rport;branch=z9hG4bK1721778447
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From: <sip:34020000002000000065@112.33.56.65:5066>;tag=332179470
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To: <sip:34020000001320000205@113.118.241.57:18669>
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Call-ID: 385231458
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CSeq: 4 INVITE
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Contact: <sip:34020000002000000065@112.33.56.65:5066>
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Content-Type: application/sdp
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Max-Forwards: 70
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User-Agent: JUNTAI SIP UAS/1.0
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Subject: 34020000001320000205:1,34020000002000000065:1
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Content-Length: 165
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v=0
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o=34020000002000000065 0 0 IN IP4 112.33.56.65
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s=Play
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c=IN IP4 112.33.56.65
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t=0 0
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m=video 33508 RTP/AVP 96
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a=recvonly
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a=rtpmap:96 PS/90000
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y=0200000681
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| INFO3 | 369535 <udp.c: 1426> MESSAGE REC. CALLID:385231458
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| INFO4 | 369535 <osip.c: 1456> 1 Pending event already in transaction !
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| INFO4 | 369535 <osip_transaction.c: 349> sipevent tr->transactionid: 134
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| INFO4 | 369535 <osip_transaction.c: 350> sipevent tr->state: 1
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| INFO4 | 369535 <osip_transaction.c: 351> sipevent evt->type: 13
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| INFO4 | 369535 <osip_transaction.c: 352> sipevent evt->sip: 90003ae0
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| INFO3 | 369535 <jcallback.c: 511> cb_rcv1xx (id=134)
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| INFO4 | 369535 <osip_transaction.c: 373> sipevent evt: method called!
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| INFO1 | 369536 <eXtl_udp.c: 452> Message received from: 113.118.241.57:18669
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| INFO1 | 369536 <udp.c: 1408> Received message len=664 from 113.118.241.57:18669:
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SIP/2.0 200 OK
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Via: SIP/2.0/UDP 192.168.200.2:5066;rport;branch=z9hG4bK1721778447
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From: <sip:34020000002000000065@112.33.56.65:5066>;tag=332179470
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To: <sip:34020000001320000205@340200>;tag=717142644a97aa49
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Contact: <sip:34020000001320000205@192.168.1.200:53922>
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Call-ID: 385231458
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CSeq: 4 INVITE
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Max-Forwards: 70
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Allow: ACK,BYE,CANCEL,INVITE,NOTIFY,REFER,UPDATE,INFO
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Supported: timer
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Session-Expires: 200;refresher=uac
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Server: WER Agent Ver 1.0
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Content-Type: application/sdp
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Content-Length: 153
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v=0
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o=34020000001320000205 0 0 IN IP4 192.168.1.200
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s=Play
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c=IN IP4 192.168.1.200
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t=0 0
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m=video 19002 RTP/AVP 96
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a=rtpmap:96 PS/90000
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a=sendonly
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| INFO3 | 369536 <udp.c: 1426> MESSAGE REC. CALLID:385231458
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| INFO4 | 369536 <osip.c: 1456> 1 Pending event already in transaction !
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| INFO4 | 369536 <osip_transaction.c: 349> sipevent tr->transactionid: 134
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| INFO4 | 369536 <osip_transaction.c: 350> sipevent tr->state: 2
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| INFO4 | 369536 <osip_transaction.c: 351> sipevent evt->type: 14
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| INFO4 | 369536 <osip_transaction.c: 352> sipevent evt->sip: 900035d0
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| INFO3 | 369536 <jcallback.c: 930> cb_rcv2xx (id=134)
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| INFO2 | 369536 <eXosip.c: 1444> Allow header contains UPDATE
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| INFO1 | 369536 <jcallback.c: 217> cb_nict_kill_transaction (id=134)
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| INFO4 | 369536 <osip_transaction.c: 373> sipevent evt: method called!
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| INFO4 | 369537 <sdp_message.c: 1481> The rfc2327 says there should be at least an email or a phone header!- anyway, we don't mind about it.
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| INFO2 | 369538 <eXutils.c: 755> DNS resolution with 113.118.241.57:53922
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| INFO2 | 369538 <eXutils.c: 779> getaddrinfo returned: 113.118.241.57 port 53922
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| INFO1 | 369538 <eXtl_udp.c: 779> Message sent: (to dest=113.118.241.57:53922)
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ACK sip:34020000001320000205@192.168.1.200:53922 SIP/2.0
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Via: SIP/2.0/UDP 192.168.200.2:5066;rport;branch=z9hG4bK396241289
-
From: <sip:34020000002000000065@112.33.56.65:5066>;tag=332179470
-
To: <sip:34020000001320000205@340200>;tag=717142644a97aa49
-
Call-ID: 385231458
-
CSeq: 4 ACK
-
Contact: <sip:34020000002000000065@112.33.56.65:5066>
-
Max-Forwards: 70
-
User-Agent: JUNTAI SIP UAS/1.0
-
Content-Length: 0
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| INFO1 | 373733 <udp.c: 1264> ACK restransmission sent.
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| INFO4 | 374410 <osip_transaction.c: 349> sipevent tr->transactionid: 121
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| INFO4 | 374410 <osip_transaction.c: 350> sipevent tr->state: 18
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| INFO4 | 374411 <osip_transaction.c: 351> sipevent evt->type: 9
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| INFO4 | 374411 <osip_transaction.c: 352> sipevent evt->sip: 0
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| INFO1 | 374411 <jcallback.c: 217> cb_nict_kill_transaction (id=121)
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| INFO4 | 374411 <osip_transaction.c: 373> sipevent evt: method called!
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| INFO4 | 374411 <osip_transaction.c: 265> transaction already removed from list 121!
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| INFO2 | 374411 <osip_transaction.c: 281> free transaction resource 121 zxw34020000001320000244-191679322
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| INFO2 | 374411 <nist.c: 73> free nist resource
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| INFO2 | 374484 <osip_transaction.c: 136> allocating transaction resource 137 385231458
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| INFO2 | 374484 <nict.c: 32> allocating NICT context
-
| INFO4 | 374484 <osip_transaction.c: 349> sipevent tr->transactionid: 137
-
| INFO4 | 374484 <osip_transaction.c: 350> sipevent tr->state: 10
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| INFO4 | 374484 <osip_transaction.c: 351> sipevent evt->type: 18
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| INFO4 | 374484 <osip_transaction.c: 352> sipevent evt->sip: 801c7150
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| INFO2 | 374484 <eXutils.c: 755> DNS resolution with 192.168.1.200:53922
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| INFO2 | 374484 <eXutils.c: 779> getaddrinfo returned: 192.168.1.200 port 53922
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| INFO1 | 374484 <eXtl_udp.c: 779> Message sent: (to dest=192.168.1.200:53922)
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BYE sip:34020000001320000205@192.168.1.200:53922 SIP/2.0
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Via: SIP/2.0/UDP 192.168.200.2:5066;rport;branch=z9hG4bK1886964964
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From: <sip:34020000002000000065@112.33.56.65:5066>;tag=332179470
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To: <sip:34020000001320000205@340200>;tag=717142644a97aa49
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Call-ID: 385231458
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CSeq: 5 BYE
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Contact: <sip:34020000002000000065@192.168.200.2:5066>
-
Max-Forwards: 70
-
User-Agent: JUNTAI SIP UAS/1.0
-
Content-Length: 0
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