> For the complete documentation index, see [llms.txt](https://support.portsip.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.portsip.com/v16.x-maintenance-mode.md).

# V16.x(Maintenance Mode)

- [Overview](https://support.portsip.com/v16.x-maintenance-mode/overview.md)
- [PBX Cluster(v16.x)](https://support.portsip.com/v16.x-maintenance-mode/pbx-cluster.md)
- [Topology](https://support.portsip.com/v16.x-maintenance-mode/pbx-cluster/topology.md)
- [Preparing Cluster Servers](https://support.portsip.com/v16.x-maintenance-mode/pbx-cluster/preparing-cluster-servers.md)
- [Configuring Cluster Servers](https://support.portsip.com/v16.x-maintenance-mode/pbx-cluster/configuring-cluster-servers.md)
- [Managing Cluster](https://support.portsip.com/v16.x-maintenance-mode/pbx-cluster/managing-cluster.md)
- [Configuring Cluster Servers for High Availability](https://support.portsip.com/v16.x-maintenance-mode/pbx-cluster/configuring-cluster-servers-for-portsip-pbx-ha.md)
- [High Availability (v16.x)](https://support.portsip.com/v16.x-maintenance-mode/high-availability-v16.x.md)
- [High Availability for On-Premise](https://support.portsip.com/v16.x-maintenance-mode/high-availability-v16.x/high-availability-for-on-premise.md)
- [PortSIP PBX High Availability Architecture](https://support.portsip.com/v16.x-maintenance-mode/high-availability-v16.x/high-availability-for-on-premise/portsip-pbx-high-availability.md)
- [High Availability Installations on Ubuntu](https://support.portsip.com/v16.x-maintenance-mode/high-availability-v16.x/high-availability-for-on-premise/high-availability-installations-on-ubuntu.md)
- [Upgrading High Availability Installation](https://support.portsip.com/v16.x-maintenance-mode/high-availability-v16.x/high-availability-for-on-premise/upgrading-high-availability-installation.md)
- [High Availability and Scalability on AWS](https://support.portsip.com/v16.x-maintenance-mode/high-availability-v16.x/high-availability-and-scalability-on-aws.md)
- [PortSIP PBX High Availability Architecture](https://support.portsip.com/v16.x-maintenance-mode/high-availability-v16.x/high-availability-and-scalability-on-aws/portsip-pbx-high-availability.md)
- [High Availability Installations on AWS](https://support.portsip.com/v16.x-maintenance-mode/high-availability-v16.x/high-availability-and-scalability-on-aws/high-availability-installations-on-aws.md)
- [Upgrading High Availability Installations](https://support.portsip.com/v16.x-maintenance-mode/high-availability-v16.x/high-availability-and-scalability-on-aws/upgrading-high-availability-installations.md)
- [Increase Size of EBS Volume](https://support.portsip.com/v16.x-maintenance-mode/high-availability-v16.x/high-availability-and-scalability-on-aws/increase-size-of-ebs-volume.md)
- [Scaling Servers on AWS for HA](https://support.portsip.com/v16.x-maintenance-mode/high-availability-v16.x/high-availability-and-scalability-on-aws/scaling-servers-on-aws-for-ha.md)