1) Got locked WRTP54G device from Vonage.
2) Unlocked using CYT, after that shows Voice setup page, but kind of screwed, VoIP not operational
3) Allows to upgrade software under the following condition: must be logged as Admin in Voice setup ( Voice_adminPage.html) , then login as admin in general
4) Upgraded to modded 3.17, important - must have factory IP address - 192.168.15.1, otherwise upgrade fails
5) After having 3.17, Voice setup looks good
We'll see what will happen ...
Everything else but VoIP works just fine for this nifty device