After about 5 hours of charging, I put the Telo registration mode and try to register the handset but it will not register.
Thinking this might be a firmware issue, I've also hooked up an old phone directly to the phone port and typed in *#*#302 to grab the new firmware but this procedure just gives me a busy tone.
The Telo and wireless adapter are about 3 months old and it all works fine with the cordless handset.
As it turns out, I was able to get the second handset to easily register.
I went back to the first handset and started mashing buttons - and one of he buttons was stuck down. Once it popped up, the handset registered just fine.