Hi thanks for your previous responses it was helpful ,so i wanna know if it's possible with CME to group together some PSTN lines, let me explain; as example i have 4 PSTN's numbers or line each of them are connected to my FXO card and i want to setup my router with a dial by extension just one number like 9 and when i press the 9 button it will look after the available line so if the line 216712222 was busy it will check for the other line 216713333 on the other FXO port .
Thanks in advance
I think we mentioned that already, use trunkgroups:
dial-peer voice ZZZ pots
You can also assign priorities to the individual lines so that these will be used in a particular order that you define.
Hope this helps, please rate post if it does!