Did not answer unrecognized number, No VM. CID: "SSI". Call came in 8:21pm.

Calling Name SSI 17:01 PDT no audio when I answered. Call dropped after 30 seconds.

Survey Sampling International:
SSI is Survey Sampling International, a survey company and had nothing to do with the SSI program by the Social Security Administration, not does it have anything to do with the Administration itself..  Opt out:  https://www.surveysampling.com/contact/
I don’t personally know if the above link will actually take you off their list, but I have been told a couple of times that it does work.