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Serge Brekeke Member
Joined: 25 Oct 2005 Posts: 17
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Posted: Tue Sep 10, 2013 5:32 am Post subject: Client behind far-end symmetric NAT |
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1. Brekeke Product Name and Version:
Brekeke SIP Server , Version 2.4.8.6/286.3
2. Java version:
1.6.0_43
3. OS type and the version:
Windows XP 5.1
4. UA (phone), gateway or other hardware/software involved:
UA with SipX
5. Your problem:
When an unregistered UA calls from behind far-end symmetric NAT, Brekeke does not detect NAT: RTP relay is OK, but it sends RTP to the far-end private IP+ports => failure.
I have tried following dial plan rule:
Matching:
$request=^INVITE
To=202
Deploy:
$nat=true
The rule fires well but the problem remains the same.
1. Why is not NAT detected ?
2. How can I make the dial rule work, i.e. force NAT traversal when it is desirable?
3. If unconditionally forcing NAT traversal might be a solution, how can this be done?
Thanks for your attention!
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Harold Brekeke Master Guru
Joined: 21 Sep 2008 Posts: 289
Location: Japan
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Posted: Tue Sep 10, 2013 9:32 am Post subject: |
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It will happen if a UA doesn't replace all of its local IP addresses from a SIP packet even though it detects the global IP address.
Brekeke SIP Server ver3 has the feature to handle it.
For version 2.4, put the following line in the [Configuration]->[Advanced] page, and restart the SIP Server.
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net.rtp.follow.remoteaddr = true
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Serge Brekeke Member
Joined: 25 Oct 2005 Posts: 17
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Posted: Wed Sep 11, 2013 12:27 am Post subject: |
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This setting works fine.
Many thanks for your quick and accurate answer! |
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