revert changes regarding ortp prototypes
revert changes regarding ortp prototypes

biddyweb/flexisip,biddyweb/flexisip,gale320/flexisip,BelledonneCommunications/flexisip,BelledonneCommunications/flexisip,biddyweb/flexisip,BelledonneCommunications/flexisip,gale320/flexisip,gale320/flexisip,gale320/flexisip,BelledonneCommunications/flexisip,biddyweb/flexisip