[asterisk-bugs] [JIRA] (ASTERISK-22933) Preventig RT packets to public IP's: res_rtp_asterisk.c:3574 ast_rtp_read: RTP NAT: Got audio from other end. Now sending to address

[Kenneth Van Velthoven (JIRA)]

Kenneth Van Velthoven created ASTERISK-22933:
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             Summary: Preventig RT packets to public IP's: res_rtp_asterisk.c:3574 ast_rtp_read: RTP NAT: Got audio from other end. Now sending to address 
                 Key: ASTERISK-22933
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-22933
             Project: Asterisk
          Issue Type: Information Request
      Security Level: None
          Components: Resources/res_rtp_asterisk
    Affects Versions: 11.5.0
         Environment: Ubuntu 12.04
            Reporter: Kenneth Van Velthoven
            Severity: Critical


Hello,

Is there a way to prevent RTP packets being send before audio is received?

Addr->IP     : 41.214.177.42:55422
  Defaddr->IP  : (null)
  Prim.Transp. : UDP
  Allowed.Trsp : UDP
  Def. Username: 81284
  SIP Options  : (none)
  Codecs       : (alaw|g729|ilbc|g722)
  Codec Order  : (g722:30,ilbc:30,alaw:20,g729:20)
  Auto-Framing :  No
  Status       : OK (255 ms)
  Useragent    : 3CXPhone 6.0.26523.0
  Reg. Contact : sip:81284 at 192.168.0.19:55422;rinstance=4740e70e6f2c901d



When intiating a call,  RTP packets are send to the private natted IP in fillcontact:

Sent RTP packet to      192.168.0.19:40046 (type 08, seq 056300, ts 015040, len 000160)
Sent RTP packet to      192.168.0.19:40046 (type 08, seq 056301, ts 015200, len 000160)
Sent RTP packet to      192.168.0.19:40046 (type 08, seq 056302, ts 015360, len 000160)
Sent RTP packet to      192.168.0.19:40046 (type 08, seq 056303, ts 015520, len 000160)
Sent RTP packet to      192.168.0.19:40046 (type 08, seq 056304, ts 015680, len 000160)
Sent RTP packet to      192.168.0.19:40046 (type 08, seq 056305, ts 015840, len 000160)
Sent RTP packet to      192.168.0.19:40046 (type 08, seq 056306, ts 016000, len 000160)
[Dec  2 14:51:27] DEBUG[9388][C-00000005]: res_rtp_asterisk.c:3574 ast_rtp_read: RTP NAT: Got audio from other end. Now sending to address 41.214.177.42:40046
Got  RTP packet from    41.214.177.42:40046 (type 08, seq 003902, ts 035644, len 000160)
Sent RTP packet to      41.214.177.42:40046 (type 08, seq 056307, ts 018016, len 000160)
Got  RTP packet from    41.214.177.42:40046 (type 08, seq 003903, ts 035804, len 000160)
Sent RTP packet to      41.214.177.42:40046 (type 08, seq 056308, ts 018176, len 000160)
Got  RTP packet from    41.214.177.42:40046 (type 08, seq 003904, ts 035964, len 000160)
Sent RTP packet to      41.214.177.42:40046 (type 08, seq 056309, ts 018336, len 000160)
Got  RTP packet from    41.214.177.42:40046 (type 08, seq 003905, ts 036124, len 000160)
Sent RTP packet to      41.214.177.42:40046 (type 08, seq 056310, ts 018496, len 000160)


When picked up the RTP packets are send to the correct public IP.

The problem is that our TRANSIT provider detects packets to private IP's as possible problems and blocks our servers.

So we would like to know if there's a setting to prevent RTP packets being send to private or any IP before audio is received.

Thanks in advance.

gr,
Kenneth.

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