How to connect own Ticket system to a foreign ticket system?

[Morten Dieckmann-Keden]

Hello,

We are currently looking into the possibility of using Jira Service Management in the Data Center version.
We would like to know how the processing of a reply from a foreign ticket system works.
As an example: We use our own Service Management from Jira and there is an interface to a foreign ticket system. Feedback e.g. on status changes from the foreign ticket system should also become part of the ticket history.
How can we implement this and create the interface to the foreign ticket system?

Thank you very much in advance.