OptOut link for opting out of entire directory?

Greetings all, so we use a Survey to "register" our participants. So the actual "survey results" are never looked at--the answers to the survey questions are injected into our iQ Directory as embedded data fields. We then filter on these embedded data fields to create samples to survey. So, we recently updated our registration survey and I am getting ready to email the people we currently have in our directory a "please update your registration information" type email which will be an invite to the new registration survey (which again will just inject embedded data into iQ Directory). The issue is that my OptOut link in the bottom of this email invite I'm sending has this code: ${l://OptOutLink?d=here}. If a person clicks this they are taken to the Qualtrics page which allows them to click a link to unsubscribe from that panel. There is a second link that allows them to be removed from ALL panels. When I tested this and clicked the first link, it does *not* opt me out in the Directory's "Opted In" column. It just changes my phone number to "-1". If I click the *second* link, it changes the Directory "Opted In" column to "No". I feel like this is kind of sketchy as I feel like the opt out link for this "survey" should do the latter, not the former. Is there a different piped text code than "${l://OptOutLink?d=here}" that I can put in my invitation that would set them to "No" in the Opted In column in the Directory? I guess I'm saying that if this is a registration survey, the act of "opting out" would mean that people want to be fully opted out (i.e. not contacted by us at all) not still be opted IN with a phone number of "-1". Or is this it in terms of opt out options and the recipient is responsible for hitting that second link? And so then I, as a matter of good practice and housekeeping, would just have to periodically delete everyone from the Directory that has a phone number equal to "-1" and, in the in-between times, make sure I'm using a sample filter similar to "phone number NOT equal to -1"? Thanks!