Greeting and a very good morning to all....

i would like to ask if anybody is keen enough to teach/guide me how to properly configure my UNIFI....
before this my VoIP got problem,very hard to make call out... (randomly accurs,and most of the time got prob)
i issued a report from my customer portal....

after that TM technician went to my house,replace new BTU/dsl modem...test my deck phone and it was functioning well...
after a day,my deck phone went into same prob again....and this time my router got no internet connection (internet indicator no blink at all)..i need to shut down my router only then my internet recovers....
so whenever i need an internet access (after i switch off main source) i need to reswitch manually my router

last night,my internet wasn't connected and manual switch on/off can't do the cure...and my deck phone is down again like always....
so i reset both my BTU and router...and after that both my internet connection (LAN/wifi went down) and my deck phone no access.....
however my iptv still functioning...

my BTU indicators all lights up:
(DSL,Internet,VoIP,Lan1) model ZTE ZXHN H268

my router/RG Wireless N Router L7-NR2000 certain indicator lights up:
(power,WAN,LAN4 (for iptv) ) wifi and internet no led...so i can assume internet connection is ok,just need to reconfigure again for which is not my field ..
please help...tqvm