You may be correct about the Via: header, but you're incorrect in the concept as to how it relates to Asterisk, notably in your reversal of what side of the transaction is putting data in the Via: header to make SIP work correctly.
This is cluttering up the list. Talk to me off line if you want a better understanding of how NAT and SIP work with Cisco devices.
Again, for those of you who might be trying to figure out what the result of this conversation is: SIP clients behind NAT works fine in both directions (incoming and outgoing calls), Asterisk makes it work, it's not using STUN. Cisco devices work especially well.
JT
At 8:58 PM -0400 7/1/03, Michael Kane wrote:
Your correct, Cisco devices stuff the WAN address in the Via: header which in turn allows the proxy to correctly register the UA for an incoming call attempt to that UA. If Mark is mentioning STUN as I said before, the only devices I'm aware of are the SNOM 100 and Grandstream 101. These devices rely on an external mechanism to properly construct the Via: header otherwise the proxy has the incorrect return IP address of the UA.
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