For the Annex B, if you are using Annex B line and the VR400 don't work on your line, you may send an email to TP-Link Tech Support (support.uk@tp-link.com) to let them check it out for you. For the...

The only thing I've seen is under Advanced-->Telephony-->Telephone numbers. But I think it may not do what you want.

If your connection is like that: ISP-----(telephone line)--- TD-W9970---(ethernet cable)---Sonicwall and the ISP provides internet with static IP, not PPPOE or PPPOA(which needs an username and...

Haven't heard about similar issues. Do you have special settings, like MAC filtering, Access control on your main router? Would the smart phones work well when they are connected to the router's...

TP-Link is not obligated to provide any maintenance or support for a device with third party firmware, you can see this on TP-Link website, as you have tried SSH, telnet or tftp, I think there is...

What's the internet IP address on the Status page of the router? Did you try a hard reset on the router?