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 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, Oct 16, 2005
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  2. Hello,
    Exactly. For instance see PortaSIP User Guide, "NAT traversal" chapter for
    more details.

    With best regards,
    Andriy Zhylenko
    Andrew Zhilenko, Oct 17, 2005
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