The call-to-listen service  works like this: The live stream of the station is connected to a regular number that is assigned to the station. Recorded shows can also be added to the number through an on-demand menu. When listeners call, they will have the possibility to either listen to the live stream of the station directly, or select an option from the on-demand menu.
Please note that your assigned phone number might change due to restrictions placed my telephone carriers- even on their "unlimited" calling features. 

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