[kanzure]

> For sites with big ticket items where the transaction doesn't take place online, it can be trickier to try and attribute the sale to a certain ad campaign.

How do they do it? One method I can think of is to show different phone numbers for users that have been cookied as coming in from different ads.

[thecosas]

The company I currently work for does exactly this for car dealer websites. We have separate tracking numbers which display on car dealership websites depending on the source.

We actually found another vendor that does this on a per visitor basis (ie. each visitor gets their own tracking number). While I think THAT is overkill, the technology is there to do this kind of thing without too much overhead.