What's the version of MAC OS? Where did you get the utility for MAC?

Firmware version is up to date? In the tplinkextender.net page in the Network in LAN settings section i have a dynamic IP... Smart IP(DHCP) is selected? Can you try static IP and change the IP...

I want to give it access to the gateway (another router) and no other internal network devices. Like guest network? If so, the problem is that you cannot configure C7 as an AP because you have to "...

Access point+wireless MAC filtering? Refer to the post here to configure it as an access point....

You can access it locally with 192.168.0.99:">http://192.168.0.99: 33445? Remotely, http:// 49.205.129.133(maybe changes) : 33445 won't work?

I don't think VOIP can be configured when VG3631 is not working as a router anymore. Why not configure the other router in WDS mode? videotron cable modem + TD-vg3631 (with WAN connect) <-- WDS -->...