asterisk users - Apr 2005 - sip phones make connection but no-sound is heared

This is the asterisk output:

 -- Executing Answer("SIP/202-8236", "") in new stack
    -- Executing Dial("SIP/202-8236",
"SIP/203|100|tTr") in new stack
    -- Called 203
    -- SIP/203-3c5d is ringing
    -- SIP/203-3c5d answered SIP/202-8236
    -- Attempting native bridge of SIP/202-8236 and
SIP/203-3c5d

It seems correct but no sound is heared on any phone,
any ideas??

Thx.


		
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