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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