"Call Return (*69) will also automatically redial the last incoming telephone number for calls received from other Optimum Voice lines and from certain calls within your calling area."
"You can only initiate a call back for calls within your area code."
"*69 cannot announce or return calls marked as private by the caller.
*69 cannot return calls placed from cellular phones.
*69 cannot return calls placed from a PBX and certain private telephone systems.
*69 may not be able to return calls received from outside of your calling area or from certain non Optimum Voice service providers."
As far as *66 goes, it only attempts for 30 minutes before cancelling.
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