Is there a way to send push from another device?

[Donny Ho]

It's grateful that I came across this article to solve my problem; however, as title, I'm new to setting this up, as far as I know was I need to have a provider/server to send the voip push, now I have all this Prerequisite settings, and I can push from the provider console, that's further I make it work.

I'm wondering how the another device can push such voip push to another devices, and I'm making a voip telephone service, or is there a way to implement?

Thank you in advance for helping.