PING: Someone on the core team. (Modem Problem)

[M. Warner Losh]

: sio0: configured irq 19 not in bitmap of probed irqs 0
: sio0: port may not be enabled

This may be your problem.  sio isn't detecting the interrupts
happening on this card, it seems, from this dmesg.  You may need to
use John Baldwin's hacks to force sio to not use fast interrupts.
This makes it possible to share it with non-fast interrupt sources.
Please let me know if you need these patches. 

Warner