Cannot make new call leg, request dropped as legService is not ready or is blocked

hello,

  I am programming by SASS in order to integrate FMS with FMG.

first,  I confige the rtmp.xml and the workflow.xml of the FMG.

second, I create a fms application, and program the main.asc:

Client.prototype.requestService = function(name){

if(!application.legService.isConnected){

  services.request(name);

}else{

  trace("FMG legservice is already connected");

}

}

the client call the requestService ,and the onConnect of main.asc is called:

application.onConnect = function(client){

trace("on connect ,the client.agent="+client.agent);

if(client.agent == "FMG Aux Leg Service 1.0"){

  return;

} else if(client.agent == "FMG Leg Service 1.0"){

       trace("2：A callLegServer (FMG) connect");

       if(!this.legService.isConnected){

              this.legService.setServer(client); 

              serviceConnected = true;

               trace("3:  connected");

       }else{

               trace("3: but no connected");

       } 

       return;

}

and the log '3:  connected' is printed

but, when I called the createNewCall function, I was told error, the application.legService.ready is false:

Client.prototype.createNewCall = function(destAddress){

trace("2：creating a new call,application.legService.ready="+application.legService.ready);

if(!application.legService.ready){

  trace("error: Cannot make new call leg, request dropped as legService is not ready or is blocked.");

  return false; 

}

return application.legService.createCall(this.clientID, destAddress, this.clientID+"-1", this.clientID+"-2");

}

what can I do to let the  application.legService.ready is true:

Thanks verymuch!