Cross Domain Tracking - time, pages visited etc.
I have a rather specific question:
One of our customers has a landing page on a domain, while the actual action takes place on another domain said landing page (a microsite) is linking to.
The reason for this is that he is responsible for the Adwords business of a company but said company gave the business of handling the site and everything related to it to another online agency: In the beginning, he tried to handle it by setting up the campaigns to target that site, but because for every single change he had to talk to the other agency, he decided to set up his own microsite he could modify at will, and redirected any traffic to the main site. Of course the problem is that this way he has no possibility whatsoever to gauge the success of the campaign.
So now my question is: how is it possible to control the performance of the campain across domains? A problem is that a simple conversion tracking won't do because most requests are made via telephone; so we have to use the usual Analytics-numbers as a proxy (time visited, pages visited etc.).
As far as I can tell he has to implement a cross domain tracking that links both sides, but how does it work once it's implemented? Are the numbers automatically exchanged once the link is established - i.e. will I be able to see how long a visitor has been staying on the main site in my Adwords dashboard or do I have to take additional measures?