Go to Settings > PBX > Call Features > Ring Group, click Add. Configure the ring group. Number: Use the default number or change the number. Name: Give a name for the ring group to help you identify it. Ring Strategy: Ring All Simultaneously: Ring all the available extensions simultaneously. Ring Sequentially: Ring each extension in the group one at a time. Seconds to ring each member: Define how long the system will wait to ring next member. Members: Select the desired extensions to the Selected box. Failover Destination: Define what will happen if none of the members in the ring group answer the call in the defined time. Click Save and Apply.