I'm in California. I plan to start installing VoIP phones systems on
hosted PBX platforms (that is, with no central PBX unit on premises).
Some of the jobs will be over $500 and thus might be contracting as
defined in California. I didn't get a straight answer over the phone
from the regulator, CSLB ( https://cslb.ca.gov ), about whether a
contractor's license is required. The classification that might apply
is Low Voltage Systems Contractor, described at

.... which says that this is anyone who "installs, services and
maintains all types of communication and low voltage systems
which are energy limited and do not exceed 91 volts. These systems
include, but are not limited to telephone systems, sound systems"
...etc. The whole thing is below.

So in California, does installing a VoIP system (where the
job exceeds $500 in total) require a contractor's license?

What about if it's just desk phones being attached to the
existing ethernet network: would that make a difference?

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C7 - Low Voltage Systems Contractor

California Code of Regulations
Title 16, Division 8, Article 3. Classifications

A communication and low voltage contractor installs,
services and maintains all types of communication and
low voltage systems which are energy limited and do not
exceed 91 volts. These systems include, but are not
limited to telephone systems, sound systems, cable
television systems, closed-circuit video systems, satellite
dish antennas, instrumentation and temperature controls,
and low voltage landscape lighting. Low voltage fire alarm
systems are specifically not included in this section.

Authority cited: Sections 7008 and 7059, Reference:
Sections 7058 and 7059 (Business and Professions Code)