asterisk users - Nov 2010 - No audio with gtalk client behind http proxy

Hi all,

I'm trying to establish jingle call in this network scenario:

Asterisk -> NAT -> Internet -> HTTP_PROXY -> GTalk  client

The call is received and answered in gtalk but there is no audio in the call.  
I suppose it could be related to the support for relay candidates in asterisk
jingle implementation.    Anybody else has faced this problem?

Notes: Asterisk 1.6.2. It works fine with natted gtalk clients not being behind
proxies.

G.
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