Executive summary: It depends on location of platform lift if it needs phone, per (2006) ASME A18.1, specifically 2.11. By a summary of 2020 edition, same requirement but perhaps different words. 2006 is last free version I could find. I was wrong in my earlier response, as in my area - assembly occupancies - it's generally not required.
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Someone recently made the case for using code terms for guards, handrails, infill, etc. ANSI A117.1 refers to elevators, and LULAs are elevators. It also refers to platform lifts, which may be vertical platform lifts or inclined platform lifts.
I'd guess most often when someone says wheelchair lift, they mean vertical platform lift.
ASME A17.1 covers elevators.
ASME A18.1 covers platform lifts.
From 2006 ASME A18.1:
2.11 Emergency Signals
If the platform is installed in an area not visible to personnel at all times, emergency signaling devices shall
be provided in accordance with the requirements of para. 2.11.1 or 2.11.2. Standby power shall be provided in accordance with para. 2.11.3.
2.11.1 The platform shall be provided with an audible signaling device, operable from the emergency stop switch, marked also with" ALARM" or from a
separate switch marked" ALARM," which is located in or adjacent to each platform operating panel. The switch marked" ALARM" shall illuminate when actuated. The
signaling device shall be audible inside the platform and outside the runway. The audible signaling device shall have a rated sound pressure rating of not less than
SO dBA nor greater than 90 dBA at 3 000 mm (120 in.) and respond without delay after the switch has been activated.
2.11.2 The lift shall be provided with a means of two-way conversation between the platform and a
readily accessible point outside the runway which is available to emergency personnel (telephone, intercom, etc.). The means to activate the two-way conversation
system does not have to be provided on the platform.
2.11.3 If the audible signaling device(s), or the means of two-way conversation, or both, are normally
connected to the building power supply, they shall automatically transfer to a source of standby or emergency power as required by the applicable building code or,
where applicable, Standard for Health Care Facilities (ANSI/NFPA 99) after the normal power supply fails.
The power source shall be capable of providing for the operation of the audible signaling device and illumination of the alarm switch for at least 1 hr, and the means
of two-way conversation for at least 4 hr.