AEL: round-robbin outgoing calls

extensions.ael：

 // File extensions.ael
 roundrobin context {
	 _X.  => {
		 Set(max=10);
		Set(n=0);
		repeat:
		Set(n=${n}+1);
		Set(last=$[(${DB(rr/last)} + 1) % ${max}]);
		Set( DB(rr/last) = ${last} );
		Dial(${DB(rr/trunk${last})}/${EXTEN},30,g);
		 if ( ${DIALSTATUS} != "ANSWERED" ) {
			 if ( ${n} < ${max} ) {
				 // Repeat cycle
				 goto repeat;
			 };
		 };
		 Hangup;
	 };
 };

TIPs：

Set(last=$[(${DB(rr/last)} + 1) % ${max}]); 這行是用來確保 last 是小於 ${max} 的整數。

其他步驟

• 建立 AstDB
  database put rr last 1
• 在 FreePBX 新增 Custom Trunk
  Local/{OUTNUM}@roundrobin/n