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AdSymetrix is an ad campaign tracking system that lets you keep up with how your ads are performing whether its online, email, or via phone.
What you do is tag your various ad campaigns so AdSymetrix can keep tabs on your campaign's performance on three different fronts. See how your ad is being passed along, see who responds to email newsletters, find out which websites are best for your particular ad, and see how many phone calls you get based on a particular ad method, whether it be a flyer, billboard, phonebook, etc. AsSymetrix also offers reverse lookup functions so you can see who's actually calling you. This all indicates that you may need a different phone number as a way to tag each ad method.
This system may appeal to many that are entering the online business marketing world, or may be wondering about comparison points in regards to offline and online ad methods. Most businesses don't have an online presence, and could even use this service to see how many customers come in from phone calls alone.
See also: Analytics Toolbox: 50+ Ways to Track Website Traffic