Thank you for the clarification.

On Wed, 15 Apr, 2020, 7:27 PM Greg Troxel, <[email protected]> wrote:

> Nishant ghosh <[email protected]> writes:
>
> > The SIP addresses are :- [email protected]
> > [email protected]
> > [email protected]
> >
> > I am getting the error "unable to authenticate. Please verify your
> > password."
> > Screenshot attached for your reference.
> >
> > Please let me know where am I doing mistake in making the call ?
>
> Your mistake is asking here instead of the support contacts for
> sip.phone.systems, whatever that is -- but it appears to be a telephony
> provider of some sort.
>
> Seriously, linphone is a SIP client.  linphone provides a free sip-only
> service, with an account that looks like [email protected].
>
> There is no SIP->PSTN gateway associated with linphone the project.
> However, I know it works with at least one provider.
>
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