Call him and be friendly like you would have been with someone you love but haven't seen for a while. Do not leave a VM if he is not there. Just say, "It's me, I call you later or if you like call me at 678868975978698794375876544".
So, he has time to prepare and you let him know you ARE calling again.
Say something like " I would love to catch up with you", or something that makes it clear that at least as friends you want to have contact. Don't push but make it clear. Men are pretty much "I hear what you say, I DO NOT translate".
