WelshPaul over at the UK VoIP forums has successfully connected a Snom phone to his OBi202. It's important to note that he had to downgrade his Snom phone's firmware to work with the OBi - details can be found here:
https://www.ukvoipforums.com/viewtopic.php?f=25&t=235&p=391
For those of you who are curious about enhancing a legacy IP phone by connecting it to an OBi, you can check out our tutorial here:
http://www.obihai.com/docs/OBi-VoIP-Device-Attach-Legacy-IP-Phone-Workbook-v1-0.pdf