How to Access HG8546M Through Its Web Interface

Hi. My ISP gave me this device.

*************** device information ***************

Manufacturer     = Huawei Technologies Co., Ltd

ManufacturerOUI  = 00259E

ModelName        = HG8546M

Description      = EchoLife HG8546M GPON Terminal (CLASS B+/PRODUCT ID:2150083569AGJ3005104/CHIP:00050020180120)

ManufactureInfo  = 2150083569AGJ3005104.C402

ProductClass     = HG8546M

SpecVersion      = 1.0

ProvisioningCode =

UpTime           = 0 day(s) 08:51:18

ReleaseTime      = 2017-11-16_08:37:56

UpPort mode      = 1

hardware version          = 10C7.A

main software version     = V3R017C10S125

standby software version  = V3R017C10S125

uboot version             = 2010.03

sn = 485754432BC1409C

*************************************************

I could gain access to it through TELNET (that's how I could pull information posted above). I can ping 192.168.100.1 but such IP address is not listening on port 80 nor 443 so I can't access its web interface.

Is there a way to unlock that feature while in a telnet session?

Thanks.