So how do you make a phone call over the PSTN and SIP networks?

Prestige 2302 Support Notes

So how do you make a phone call over the PSTN and SIP networks?

Two examples are described next.

Example 1:

To make phone call over the PSTN and SIP networks, enter the pin code if required. SIP initiates the call and forwards it to PSTN.

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ZyXEL Communications P-2302HW Prestige 2302 Support Notes, So how do you make a phone call over the PSTN and SIP networks?