My VOIP is with Google Voice on OBI 202 ATA. Was working fine on N66U running John's Fork. Can't get it to connect on the latest Merlin with Diversion (clean install) on AC86U. I have a fixed IP, DNS 8.8.8.8 for the device. I've tried all three settings for SIP Passthrough, without success. Obitalk shows
Connecting to 172.253.115.125
Backing Off : Authentication error
Connecting to 172.253.115.125
Backing Off : Authentication error