First of all, I setup a Ring Group 2001, members [ext. 201,202,203], LINEAR ring mode.
When I use ext. 204 call 2001, ext. 201, 202 and 203 ring one by one (LINEAR) which works very fine.
But when I setup inbound FXO (PSTN) trunk with SLA feature, I set DID (Direct Inward Dialing) to Ring Group 2001.
So I expect when this PSTN line is being called, ext. 201, 202 and 203 ring one by one. (LINEAR)
Unfortunately, ext. 201, 202 and 203 ring all at the same time. (RING ALL)
Any comment is appreciated very much