Called a few times in the past couple of days; they have not left a message on voicemail. I looked a few things up on the internet out of curiosity, and this seems to be a number used to solicit donations for the Illinois Special Olympics. Putting "ilso" in google returns one of their websites (soill.org) as topmatch - not listed in the google results at all, but also registered to them (and hosting a mirror of the site), is ilso.org.
It's a Lake Forest number, but I don't see it on their site, so it's likely a contracted call center for fundraising purposes.
I just wish they wouldn't call me at 8:30 at night.
I've been called by this number FOUR TIMES since Monday (Today is Tuesday!), and have answered never (due to meetings, etc). Each time, however, they end up in Voice Mail, but leave no number. But the message does pick up background noises, everything from tele-marketing center sounds to those of a family talking. Hard to make it out. Thanks to this site, I'm not planning to answer (SOIL has gotten contributions from me in the past, but not with this kind of "help!").
I got these calls several times, too. I asked who was calling and she identified herself as Vicky (sp?) Parrish (sp?) or Parish (sp?) with the Illinois Special Olympics. ISO is located in the 1600 block of Honore in Chicago, IL. No text came up on Caller I.D. or the number. Had to get it from Star 69. The caller could also be programming the Caller I.D. read out to read what they want.