remote viewing

hey guys ..haven't posted a question here in years

2 questions

1--- my mom has a surveillance system hooked up to a DOWSON dvr ...

my dad passed away a month ago and id like to keep eye on her house

I know a little about this stuff ....she has cablevision (long island..ny)

I need to know how to remotely view it

I know I have to get her external ip

it says port 80

it also says port 9000

it also says something about port 21

do I have to go into router settings ???hope not

what app do I use for my android ???

do I enter ip then www forwardslash or something

if I remember correctly his credentials were admin ,admin....her cameras are hardwired and Ethernet is hooked up to the router

.......my 2nd issue is my house ..

have an old desktop , installed avermedia card in it years ago with 4 hardwired cameras...I know I need how to remote view

want to use same android , on avermedia settings it says use port either 5550 or 5050 ( don't remember)

I'm using teamviewer for a few years to moniter , but not thrilled ..

in both situation do I have to enable remote viewing or any other thing in settings

ps ,,I tried this years ago on my system but never was successful ...

thanks in advance

Get the exact model if the DVR and call Dowson. There are numerous ways to remote view. From looking at their website it looks like they offer QR code scan, so that you dont have to open ports in the router.