In India core sip providers are hard dude, i tried first with exotel but there did number is not free and its expensive. Then i tried talking to Aritel and JIO that anyway we are getting voip as a part of there wifi plans, i can somehow deploy that on those physical numbers using asterisk pbx , good luck with that tried alot but hard, then currently i am using
https://bow.chat/voice, atleast my did and sip is taken care of i am using my own webhook that i created with livekit and a python wraper on their did number.