SIP and end-to-end

Discussion in 'VOIP' started by Georg Schwarz, Oct 16, 2005.

  1. Common wisdom says that for a SIP-based telephony session the media
    stream is directly end to end.
    However, for both FWD and sipgate.de I figured that the media stream
    goes via the respective provider. I would assume the sip proxy to
    manipulate the Invite messages accordingly.
    Is this being done to better cope with NAT devices and firewalls?

    --
    Georg Schwarz http://home.pages.de/~schwarz/
    +49 178 8545053
     
    Georg Schwarz, Oct 16, 2005
    #1
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  2. Hello,

    > Common wisdom says that for a SIP-based telephony session the media
    > stream is directly end to end.
    > However, for both FWD and sipgate.de I figured that the media stream
    > goes via the respective provider. I would assume the sip proxy to
    > manipulate the Invite messages accordingly.
    > Is this being done to better cope with NAT devices and firewalls?

    Exactly. For instance see PortaSIP User Guide, "NAT traversal" chapter for
    more details.
    http://www.portaone.com/resources/docs/PortaSIP/m-r-11/PortaSIP_User_Guide_MR11.pdf

    With best regards,
    Andriy Zhylenko
    --
    Andrew Zhilenko
    Please remove "hide-email." from my email address when replying,
    so my address should be andrew (at) ti dot cz
     
    Andrew Zhilenko, Oct 17, 2005
    #2
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