I've got an old telephone system I need to connect a SIP phone to. Right now it's connected like this (pbx) <-> (ata) <-> (VoIP system) <-> (SIP Phone). I'd like to remove the (VoIP system) by registering the SIP phone directly to the (ata) since it simply needs to be a pass-through with no logic. I don't know if there's a simpler way, but I was thinking I could embed Asterisk on an ATA to achieve this. Can anyone provide any pointers on how to do this, or suggest other solutions?