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The above link is to a device that you plug your telephone handset into and then use a standard 1/8 inch mic out for recording. You could plug that into your mixer
You’d have to talk into the handset, rather than use your studio mic.
Another way might be to use an computer based online phone service like Skype or Net2Phone. You could use whatever mic you plug into your computer while you dial out.
Let us know what sort of solution you devise.
Robin Valley Community Radio