> "Arnold Lee." wrote:
> 
> Hi all
> 
> UAc is behind a NAT.
> Can UAc set special ip address in its Via "received" parameter ?

No; the "received" parameter is added by the *server* (UAS or proxy) that 
actually received the SIP message.  UACs cannot start off with a Via that
includes the received parameter as well as the hostport part.

- vijay
-- 
Vijay K. Gurbani  vkg@{lucent.com,research.bell-labs.com,acm.org}
Internet Software and eServices Group 
Lucent Technologies/Bell Labs Innovations, 2000 Lucent Lane, Rm 6G-440
Naperville, Illinois 60566     Voice: +1 630 224 0216   Fax: +1 630 713 0184
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