How do we establish communication between 2 instances of Jira

[Sravan Manne]

We are 2 companies who have our instances of Jira, we would like to collaborate via project to project, issue to issue links across these 2 instances. 

Wondering if there is a popular approach  already in place, so that we do not have re-invent the wheel..

[Alexey Matveev]

Hello,

Have a look at the federating instances:

https://confluence.atlassian.com/adminjiraserver/federating-jira-managing-multiple-instances-961257360.html