3
8
[Conference call]
The system supports extension and exterior conference call. The number of
participants is not limited and can be reasonably used according to the call effect.
Generally, it is recommended that the exterior line should not exceed 3 and the
extension line should not exceed 8.
[Busy tone detection Quick release]
The system adopts the dual mode scheme of independent busy tone detection and
chip detection, which is more efficient and faster to release the exterior line in the
busy tone state.
[Multilevel lightning protection]
In the power supply part of the system, the input supports lightning protection,
over-voltage protection, over-current protection and under-voltage protection, and the
output supports over-current protection, over-voltage protection, overload protection
and short-circuit protection. Extension and exterior port, provide three-level lightning
protection circuit. The system must be reliably connected to the ground to provide
effective lightning protection.
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