There is a problem codec selection on Asterisk 13.13 . When calls starts from Operator to Uac and when Uac only supports a codec , it doesnt have codec conversation so that one side voice can be hearable. There is example as below.
if operator side changes codec order like alaw,ulaw,g729 , there isnt any problem
I tested with same conf on Asterisk 11 , there isnt any problem. it works now on asterisk 11 very well.
it is chan_sip configuration;
[Operator] allow=g729 allow=alaw allow=ulaw [uac] allow=729 allow=alaw allow=ulaw
Could you check it please.