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SIP and end-to-end

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?

Reply to
Georg Schwarz
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Hello,

Exactly. For instance see PortaSIP User Guide, "NAT traversal" chapter for more details.

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With best regards, Andriy Zhylenko

Reply to
Andrew Zhilenko

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