DUB,

Well, I used the VM app (figuring that the remote forwarding feature wouldn't be able to discern between the HG 127 and the mailbox for 127).
It has the same effect. It takes about 5 1/2 rings to transfer the call.
If it helps, I had someone at the location test the extension internally, and they said they heard one ring, 30 seconds of music, and then the call was transferred. So outside callers hear rings, while inside callers hear one ring and then music. Interesting. Wish I knew what was making the transfer to VM take so long.

Carrie