8.7.26


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VoLTE problem.
MIUI 10 8.7.26 installed on Xiaomi Mi Mix 2.
Please fix the option to disable VoLTE.
Because this function is not supported by all the countries. For example, in Uzbekistan there's no volte function is enabled in operators network. So, the main reason why I'm complaining about this functions, is because all the the phones with enabled volte function are have the issues with call connecting. It takes too many seconds to connect, and sometimes it may fail to connect. and then, phone switches to HSDPA mode (3G) and only after switching the connection may be established.
Please fix the issue.
 

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VoLTE problem.
MIUI 10 8.7.26 installed on Xiaomi Mi Mix 2.
Please fix the option to disable VoLTE.
Because this function is not supported by all the countries. For example, in Uzbekistan there's no volte function is enabled in operators network. So, the main reason why I'm complaining about this functions, is because all the the phones with enabled volte function are have the issues with call connecting. It takes too many seconds to connect, and sometimes it may fail to connect. and then, phone switches to HSDPA mode (3G) and only after switching the connection may be established.
Please fix the issue.
enable disable VoLTE dial *#*#86583#*#*
 
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I noticed that, by pressing the on / off> reboot button, I find another 2 "buttons", but what are they for ?, have you seen 2 buttons?
 

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I noticed that, by pressing the on / off> reboot button, I find another 2 "buttons", but what are they for ?, have you seen 2 buttons?
Screenshot_2018-08-05-14-03-02-366_com.miui.home.png

 
VoLTE problem.
MIUI 10 8.7.26 installed on Xiaomi Mi Mix 2.
Please fix the option to disable VoLTE.
Because this function is not supported by all the countries. For example, in Uzbekistan there's no volte function is enabled in operators network. So, the main reason why I'm complaining about this functions, is because all the the phones with enabled volte function are have the issues with call connecting. It takes too many seconds to connect, and sometimes it may fail to connect. and then, phone switches to HSDPA mode (3G) and only after switching the connection may be established.
Please fix the issue.
Problem is not caused by VoLTE setting in the phone, (if not enabled in the Operator's network, there is no APN for IMS, which is required for VoLTE).

The problem you are experiencing is with the Operator's configuration of CSFB (Circuit Switched Fallback), which does the RRC Release from LTE, with Redirection to 3G for the CS (Circuit Switched) voice call to be established.

There are many parameters in the Operators network that need to be optimised for CSFB to work as quickly as a 3G CS voice call.

As an example today in Movistar España, CSFB added an additional 0.75 second to call setup time, with a total call setup time of 4.8 Secs, from Extended Service Request message (LTE layer 3 message) for call establishment to Alerting (UMTS NAS message).

These times were captured using full subscription version of Network Signal Guru, on MiMix2, with 8.7.26 firmware, VoLTE enabled but not functioning (Movistar España has not opened VoLTE service yet).
 
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