No.
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The neutral bus
when you hook two batteries together and keep the same voltage by connecting the POS post of batt #1 to POS post of batt #2 and the NEG post of batt #1 to the NEG post of batt #2. this will give you 12 volts of power for a longer duration.
No way
Yes if you pay for the service and pay the hook up fee
Off hook must be at least a 20 mA draw. The upper end is usually determined by line resistance from the CO to the phone. The normal range seems to be 25-45 mA. On hook voltage is a nominal 48V. However if you understand batteries, (in your car the battery is spec'd as 12 V but 14 V is usually what you get) 48 V is the low end and you can get as much as 56 V but due to various factors 53 V seems to be the usual normal. Off hook voltage is determined by line resistance and the actual phone. Normally 6-9 V is what you will see at the phone.