Grandstream HT813 FXO to W70B

[rainecc]

Is it possible to connect a Grandstream HT813 FXO port to the W70B to allow inbound calls on my PSTN line to hit the W70B and be delivered to the DECT connected phones?

The HT813 supports a SIP registration and/or a proxy for the FXO port. The FXO port is physically connected to my PSTN line.

I see that the W70B has port 5060 listening so it looks like it allows sip incoming, but how would I connect to it from the HT813? Does the W70B support incoming/anonymous registration? Is there a way to set an inbound username/password? Is it as simple as setting up another "account" in the W70B interface? I can't seem to do this unless I use the address of an existing sip trunk. Can I use the W70B as a SIP proxy and put the target SIP details into the HT813 (username/account/password etc?)

Any help very much appreciated as I really don't understand how this all fits together.