SIP/RTP Proxy/Tunnel?

Discussion in 'VOIP' started by John Sutter, Jul 21, 2003.

  1. John Sutter

    John Sutter Guest

    I want to use a SIP softphone from my office to my Asterisk box
    at home. At work I am behind a NAT firewall that does not allow
    incoming UDP. At home, my machines are also behind a NAT firewall
    but I can map what I want.

    I've been looking at NAT SIP proxies out there and I don't really
    see what I'm looking for. Before I go too far writing what I think
    will work, is there anything out there already for me? I am anticipating
    a component running at work communicating with a component at home over
    one or more TCP sockets. The side of things sounds doable, but I'm just
    starting to read up on RTP.

    -- John
     
    John Sutter, Jul 21, 2003
    #1
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  2. John Sutter

    Peter Guest

    I want to use a SIP softphone from my office to my Asterisk box
    Similar situation here. So far I haven't been able to set up SIP proxy
    behind NAT - the firewall has to inspect SIP protocol and create NAT
    mappings for voice UDP connections, and my Cisco won't do that. There are
    three ways out:

    1. Put your SIP proxy behind NAT in DMZ
    2. Install another Asterisk at work and use IAX - single UDP port works well
    with NAT. Maybe gnophone could also work?
    3. Install tunnel. Check out vtun.sourceforge.net - adds only 5-10ms to
    latency even with compression (LZO) and encryption (Blowfish)

    Hope this helps,
    Peter
     
    Peter, Jul 21, 2003
    #2
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  3. Both the Cisco IOS NAT and Cisco PIX NAT have SIP ALG's...
     
    Cullen Jennings, Jul 28, 2003
    #3
  4. John Sutter

    stefantch

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    SIP phone behind NAT

    Hello John,

    This site might have a solution for you
    http://www.d-tunnel.com

    They have a software called SIP Tunnel that helps users to connect SIP networks even if their UDP is blocked.

    Best regards,
    Stefan
    ----------
     
    stefantch, Oct 13, 2006
    #4
  5. John Sutter

    jani12

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    Complete voip tunneling and encryption solutions can be found at mizutech.
    You might check this: mizu-voip.com/Products/VoIPTunnel.aspx
    They have both client and server side solutions.
     
    jani12, Jul 8, 2010
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