I have a small home setup with one Cisco 7960 SIP phone, one WISIP, one FXO connected to Bell Canada PSTN, and four FXS connected to POTS phones throughout the house. I also have an account to a SIP based DID provider. My problem is when I'm on a call on one of the FXS connected phones and receive another call either via the PSTN line (assuming the call I'm on is using my SIP account) or SIP account I can hear my other phones ring but don't get the call waiting tone on the phone I am (it works great on the Cisco though). I can run to another phone and answer the call or let it go to VM but I would really like to be able to pick it up using the FXS connected phone. I did a bit of searching and it doesn't seem like it's possible... Is there a way or is it on the roadmap for an eventual feature? Is this a software of hardware limitation? This is really important, it's seriously affecting the WAF for this project... ;-) I'm starting to think I should have gone with SPA's to support my POTS phones... :-( Thanks!