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
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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 - adds only 5-10ms to
    latency even with compression (LZO) and encryption (Blowfish)

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


    Oct 13, 2006
    Likes Received:
    SIP phone behind NAT

    Hello John,

    This site might have a solution for you

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

    Best regards,
    stefantch, Oct 13, 2006
  5. John Sutter


    Jan 9, 2010
    Likes Received:
    Complete voip tunneling and encryption solutions can be found at mizutech.
    You might check this:
    They have both client and server side solutions.
    jani12, Jul 8, 2010
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