My apologies if this has already been answered in this subforum but I couldn't find much on it, just general references. So far I only ran "normal" CPA/CPS type of campaigns (and the user always stays on his computer, keeps clicking links or filling out forms so it's easy to split-test stuff and track subids etc.). But how does this work on a call offer? I want to launch a bingads ppc campaign with the call extension, so now someone on their mobile sees my ad and taps on the phone number. Since I only have 1 phone number (and not one for every keyword and ad in my bing campaign), how do I know which keyword drove the conversion? I have access to cpvlab if that is of any use in this case. Would appreciate some advice from you pros!