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Hello
I need help Can´t get ringing or vibration in Viber App. I tried every thing in the installation using system sounds, but it didn´t help.
That's something you'll have to check with Viber support services, as it is a thrid-party app. Could be something wrong with the app and may be fixed in a future update.
Hi,
I'm an official representative from Viber. I'm here to help 
It could be that the network you are connected to is blocking Viber's traffic.
1. First, please try uninstalling and reinstalling Viber when connecting to a few different WiFi networks (in order to pinpoint the source of the problem). What are the results?
2. Also, please make sure the following ports are enabled ("forwarded") on your routers or firewalls:
TCP: 5242 + 4244
UDP: 5243 + 9785
(if you are not sure how to enable ports, you may contact your router manufacturer or your Internet Service Provider)
Does the problem still persist?
thanks
it did help