Using the sites framework, can I create a link between sites?

Question

I have 2 sites setup with Django CMS with the following pages:

Site 1:

• Terms (app_hook is linked to my Terms app)

Site 2:

• Home

On Site 1, if I use reverse('terms') in a template I get /terms.

If I do the same thing on Site 2, I get Reverse for 'terms' with arguments '()' and keyword arguments '{}' not found.

How can I link from Site 1, to an app that is hooked on Site 2? Have I missed something glaringly obvious?

Using:

• Django 1.4.5
• django-cms 2.4.3

Many thanks.