RE: POTS support, and some of the general comments in this thread:
You, the typical individual user/VoIP enthusiast/hacker, are not the target market for this product. It's not meant to be a SOHO phone. It's a business-class IP phone, comparable to the high-end models from other enterprise IP phone vendors like Cisco and Avaya. It's intended for installations in offices with some sort of local or cloud-based PBX or managed SIP ITSP service. In these scenarios, the business has migrated off of individual POTS lines at the desk, and is rolling out IP telephony. Thus, a POTS connection isn't generally needed, would be redundant, and would just be wasted extra cost to implement. I agree that adding compatibility for the OBiLINE dongle would be relatively easy, and I assume that Obihai will eventually get around to adding it. Remember, this is a brand new product, and they are pushing new firmware updates every few days at the moment, so more features and bug fixes will rapidly appear.