I have AsteriskNOW server with OpenVOX800 A800P PCI card with 2 modules.
I connected two landlines from them,
I created two trunks for them and one inbound route and one outbound route.
I created a ring group which has one sip extension and one external number.
When calling the ring group, the sip extensions ring for 3 seconds and the call disconnect the sip extension and forwards the call to the external number.
I want to make it like that "when calling the ring group, the call should ring the sip extension with the external number in the same time. and if no one answer, the call should be directed to voicemail".