VOIP and POTS

I have seen a configuration on a router using:
#Dial -peer- voice 2222 Pots
#Destination pattern 22222
#port 0/1/0

is POTS used only when configuring an analog phone plugged to FXS port ?
if it was a digital phone, would we replace POTS keyword with VOIP in the configuration above??

I also have seen a configuration between Routers, but they use VOIP
something like:
#Dial -peer- voice 2222 VOIP

so is between routers , it has  to alwasy be VOIP and never POTS ??

thanks

jskfanAsked:
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sr75Commented:
Simple rule of thumb....

If it goes to an IP Address then use VoIP, for everything else use POTS.
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jskfanAuthor Commented:
is this a rule too:
Between routers and phones use POTS
between routers only use VOIP

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sr75Commented:
no.  If the phone plugs into an FXS port then you use POTS.  If the phone has an IP Address you use VOIP.  Also you can have analog trunks go between routers (i don't know why you would but you can) and those would be POTS.  Otherwise, you would use VOIP between routers.
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jskfanAuthor Commented:
thanks!
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