I have been getting this bad behavior on an Obi202 as well.
I discovered today that when the GV line on my SP1 gets into this behavior, even calls going out an actual SIP connection to a VoIP provider other than GV also gets only the intercept recording with numeric error codes after a bunch of babble.
The only thing I can do to clear it is to reboot the Obi device, and then after a while, try calling again.
I was trying to reach someone this evening who had a bunch of phone numbers listed.
Several of them are old numbers that have been disconnected, and calling through to them had a strong probability of putting the Obi into this bad mode, in need of a reboot.