It is indeed Trulia. I am a Realtor and get these solicitations all the time from various marketing websites. Its a catch 22 business when all you do is plaster your phone number all over the internet, print media and street signs...it opens yourself up to all kinds of solicitation! I typically politely just tell them I'm not interested in they will stop calling. Some of them are persistent but if you stand firm they won't bother you anymore. Its when you ignore them that they keep calling!
When I have time I like to screw with them, I'll ask a million questions and then I tell them that prices are too high and see how low they will go. This usually gets a "manager" on the phone and they make an offer. I then tell them I need to go. They tell me the price is only good for 24 hrs. When they call back the next day, I'll tell them how I wasted their time on purpose and if they call me again I will continue to waste as much of their time as possible. They get pissed off, but they won't call again! Works every time.