Hot standby with PSTN lines

Greeting to the community,
Sorry about my English.
I would like to know if it is possible to configure the Failover or the Hot standby taking into account the PSTN lines for example.
Let me explain: suppose I have IPPBX S100, i configure the hot Standby, it works. But on the Primary I have a PSTN line, which allows to make and receive external calls. If the primary breaks down, the secondary will take its place but will not be able to manage the PSTN line therefore not incoming and outgoing calls.
How do we handle this case?
- Manually unplug the line on the primary and fart it on the secondary?
- Automatically? And with what equipment?
Thank you. I hope you understood my question.


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