Hi mates,
I solved the problem by disabling use_mediaproxy() call and did put nat=yes in the Asterisk side.
Many thanks to Daniel and David.
Cheers,
Lu.

--
Luzango Mfupe
TUUNE MOBILE
Tel:0128440528/0123825710
Tshwane-RSA

"...Ships are safe in harbor, but they were never meant to stay there......."