Cyndy, I have received this call on 3 different days. I finally did pick up today. I said 'may I help you' and no one answered - finally hung up. I too am in software related field.
maybe we all work in the same type of business? I am in B2B sales and Business Development, I missed a call from this number as well, they left a voicemail, but it just sounded like someone mashing buttons.
I've had the same call on my work line twice now, too. I'm in IT/databases, so probably different business. I'm going to pick up next time and figure out who this is.