Thanks for replying!
Apologies for my confusion, but none of the instructions I followed at http://docs.yate.ro/wiki/Connecting_To_Google_Voice
are about setting Google account data during routing, and none of my logs show setting Google account data during routing.
This is the route that I used in regexroute.conf, which I cut & pasted from docs.yate.ro:
Are you advising me to remove the regex from the route? I tried replacing the regex with the explicit phone number but got the same error. Does "Jingle call failed. Incomplete caller" mean that google account data is wrong, or does it mean a parameter is missing?
Thanks again for your help.