You have only provided the general section, but without the section name. Please provide the complete contents including the entries corresponding with your X-Lite and your service provider. If not using SIP for your service provider, please provide the channel technology configuration file for the technology actually used.
If these don’t exist, you have not yet passed the foundation course level and need to read the documentation, or hire a consultant.
Also please note that it is maybe half a decade since canreinvite was replaced by directmedia, and it is
Letting in anonymous callers is not a good idea.
You configuration appears to be set up for Astterisk to be on a public address, and the phone behind NAT, but you never mentioned this, important, detail.
You will also need fairly standard dialplan entries.
If pokhraj is an ITSP they are a strange one if they register with you rather than have a static address, and also strange in actually authenticating incoming calls.
Also you did not explain why your network requires the particular NAT workaround options that you are using, especially as it has none of the options associated with the more typical, Asterisk inside NAT with ITSP outside, configuration.
I have updated the dialplan at previous update.
Since my asterisk server running on cloud it has a public static IP, through which softphone is connecting.
Moreover my asterisk server is not behind NAT. Whereas my softphone [x-lite] behind firewall but it is connecting fine to my asterisk server.