asterisk users - Jan 2011 - IAX between 1.6 and 1.8 has bad voice quality

I recently upgraded my office server to 1.8 and since then I have very
bad voice quality when calling another Asterisk server that uses 1.6.
The links is via IAX2 and I have tried using g729 and ulaw but I still
have the same problem although ulaw has a slight better result.

	Any changes that need to me made to the IAX2 trunk for it to work?

-- 
Telecomunicaciones Abiertas de M?xico S.A. de C.V.
Carlos Ch?vez Prats
Director de Tecnolog?a
+52-55-91169161 ext 2001
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