Im using a GSM gateway with 4 channel, where 1 channel is used for incoming and other 3 are being used for forwarding.
Right now, when a customer calls, I can see that, it tries to call the 3 numbers defined in RING group and if no one receives, it simply disconnects.
While I need it to be configured this way that,
FreePBX will call the 1st 3 defined numbers for 5 rings, if no one of the 3 receives the call, then it should try the next 3 numbers and it again tries them for next 5 rings, if those 3 also doesnt receive, then it should try the next 3 numbers and so on the loop should happen until someone really receives the call.
How to achieve this ?