MI DOUBT IS THE NEXT I HAVE 3 PBX CONECTED A, B AND C AND I USE CODE TSC 61 FOR CONECT FROM A TOWARD C , I DIAL 61151XXXX FORM A TO C AND MY QUESTION IS HOW IS THE PROCESS OF CONNECTION , IF I SEND 61151XXXX TOWARD C OR SEND 151XXXX, SOME IDEA OVER THIS CODES?