One big issue you would have, if you were able to have both SIP and analogue trunks existing at the same time AND going to two places...is...what happens on incoming calls? They ring on both systems, depending on who (which system) answers first, that system now has the call. There is no "transferring" it over to the other system. Are you planning on having two phones on each desk? Just sounds like a lot of confusion.
Having two "live" systems, co-existing, in the same business, is not a good idea.
FXS gives you analog stations. Then you plug your fax, old phone, alarm, etc. into it. Easy peasy.
At this point I'm not sure it's worth the time and all the headache of getting it all reliable. I'd rather pass on a job then my rep take a hit for something that will not work...
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