Not sure if this topic should be under Telco Talk or networking. 

Last week DiGi upgraded service with VoLTE, on handphone it showed the icon. 
I have Huawei E5186 router that supports VoLTE, I search in internet but can't find info about setting up VoLTE on router, not even sure if it is automatically setup or what. 

Connect normal phone to the RJ11 port the dial tone is engaged dial tone not working.
If set to 3G or Auto then can make call, but it is not VoLTE just normal call, and at LTE when make call it will drop to 3G and come back to LTE after the call, with this the ping and speed is haywire.

Expert please advise 

Just now i asked seller, he said Huawei never officially stated that E5186 supports VoLTE 
In the internet all articles about this router says VoLTE is supported, but noone tested it.
The router i received is with Huawei logo not other Telco logo.

RM865 through Lelong.  I bought 3 of them running 3 Infinite 150 at 3 locations.  Earlier I thought of want to save money and bought 3pcs TP-Link MR200 and ended up like sh*t performance and poor wireless connectivity, have to throw aside wasting $$$.

I hate Huawei for extremely little setting options and never have any official firmware update, however they have the best 3g/4g performance.  Under same environment, E5186 max speed is 25% higher than MR200 and ping is more stable, MR200 has spikes (even with LAN). For wireless, MR200 from time to time has high ping between device and router itself, tested in place without neighbourhood wireless interference.