Communication Channels help you add video calls, chatops and external links to an incident. Additionally, you can create a dedicated Slack Channel for an incident using the Communications Card.
To add a Communication Channel, Click on +Add Link -> Select the type of channel you want to add -> Add the link and Text to Display for your Communication Channel -> Click on Save
Once added, you can Edit/Update the Communication Channel.
Any activity in the Communications Card, gets reflected on the Activity Timeline of the incident.