# Firewall Settings

MiTeam Meetings uses services provided by the CloudLink platform (chat, authorization and authentication, and dialing into meetings from the PSTN) and Amazon Web Services (AWS) Chime SDK (audio, video, and screen sharing requirements). As a result, MiTeam Meetings requires the destinations and ports described in this topic to support various services. If inbound or outbound traffic is blocked, it might affect the application’s ability to use various services, including audio, video, and screen sharing, and chat.

MiTeam Meetings requires the following network hosts and ports for it to function.

## Hosts

- *.mitel.io
- *.amazonaws.com
- *.bugsnag.com
- fonts.gstatic.com
- cdnjs.cloudflare.com
- *.chime.aws

## Ports

- 99.77.128.0/18
- TCP/443
- UDP/3478

Web sockets used in the MiTeam Meetings also require an entry in the allowed list for *.amazonaws.com for the ports defined in https://docs.aws.amazon.com/iot/latest/developerguide/protocols.html.

If you are using a proxy, ensure that it proxies WebSockets and HTTPS.

Check using Amazon Chime Readiness Checker whether your firewall rules require updating.