We started a conversation like this in a different post but it never really got answered. Hoping for some insight... Our trunk to the SIP provider goes down periodically for 10 minutes. Weird since on Elastix it never went down BUT Elastix and Cisco allow a primary trunk and secondary trunk using the same DID so it may have but just failed over to the backup. So my question is this... is there a way to add a backup aka failover aka secondary trunk with the same DID? Example One: 5615551212 JFK-A.voicepulse.com userABC123 Pwd12345 5615551212 JFK-B.voicepulse.com userABC123 Pwd12345 Example Two: 5615551212 Miami.voip-provider.net user789 pwd98765 5615551212 Chicago.voip-provider.net user789 pwd98765 5615551212 Houston.voip-provider.net user789 pwd98765 Whenever we try to add a trunk it says that DID is already in use and thus can't add it. Our provider gives us 1 DID with 4 simultaneous trunks and they have two sites for failover. (Voicepulse) We just became 3cx partners and want to roll this out to our clients but the single trunk connection makes us nervous. On a SEPARATE note... we are still trying to figure out why it goes down (usually at 11pm but not always) The internet stays up, the firewall reports no issue, and Voicepulse tells us exactly if there is ever any outage. Weird. But not as critical and easier to troubleshoot if we had the JFK-B failover in place as then we could see if both trunks go down or just one. 3CX has MORE features the Cisco UC devices (kinda shocking) so very surprised we can't add the secondary/backup trunk. Thank you in advance for any help!