It was a commodities trading firm. I still barely know what they do. But, I would answer the phone, listen to whatever they said, understand not much and then I would say “lemme put you on hold” and then I would turn to the nearest person not on the phone and I’d say something dumb like “They’re calling about like…salt maybe?” And then I’d transfer to that person and they would figure out who it went to. (They all knew who was trading what that day. Nobody ever told me.)
Personally, I’d get a kick out of it, but I wouldn’t do something like that myself.

I’d add a little more detail to your message just to make it clear what will happen in your inbox. “If I don’t hear otherwise, I’ll assume that your issue was handled by my colleague” or “Please cc me if you contact Jane, and I’ll check back in on my return if I think your issue is still open.”
Meanwhile, I do sometimes put up long ones when I will be away for some days during a season in which there are a confluence of three or four very likely reasons someone would contact me, and who else they need to contact isn’t the same. Like, it’s high llama grooming season, and generally during this month I get two or three requests per week for each of llama bleaching (for which my backup is Stella), llama shaving (for which it’s Arturo), and llama perming (for which it’s Carter). My message says I’ll be out until blah blah, and if it’s not an urgent llama grooming issue, I’ll get back to you after that, but meanwhile, for urgent llama grooming here’s who to call.