Ok, in theory wise, there may be dictatorship by a phone provider on top to provide QSS service to specific server for VoLTE so they give that priority to their servers only. But end user/ application can easily control the data priority for them self also.
Meaning like normal priority scale if we assume 1 to 10
1 is top priority & 10 is least. This time provider give 1 priority to there VoLTE server else every thing is may be 5. If enduser on mobile phone side able to change these priority on there side like make all application priority 1 & VOIP.ms server priority 5. So connection between Voip.ms server have more authority which fulfilling VoLTE requirement. So Roger on top level not did anything on lower level user control everything.
Meaning like normal priority scale if we assume 1 to 10
1 is top priority & 10 is least. This time provider give 1 priority to there VoLTE server else every thing is may be 5. If enduser on mobile phone side able to change these priority on there side like make all application priority 1 & VOIP.ms server priority 5. So connection between Voip.ms server have more authority which fulfilling VoLTE requirement. So Roger on top level not did anything on lower level user control everything.
Satisfied Customer from these providers :-
➡ Koodo Mobile
➡ Public Mobile
➡ Tangerine Bank
➡ Koodo Mobile
➡ Public Mobile
➡ Tangerine Bank