Anyone got: 
umsm0 at uhub7 port 2 configuration 1 interface 0 "Sierra Wireless Sierra Wireless MC5720 Modem" rev 1.10/0.01 addr 2
ucom0 at umsm0
To work on OpenBSD?

I get basically no output from the modem using this in /etc/remote:
mobile:\
        :at=hayes:dv=/dev/cuaU0:dv=/dev/ttya:tc=direct:tc=unixhost:

# sudo tip remote
connected

And then I can type AT all day long and get no response.  The modem
isn't activated but I don't want to go spend money on activating it
unless I know if that is what is causing it to not respond.

Something else weird is that if I fart enough with tip and stuff to get
to the modem and reboot with it on it hangs the IO subsytem.  Not sure
why a serial port is sitting on IPL_BIO but that is a different story.