Why ISDN phone is unavailable

The causes are as follows:
- The ISDN phone has no power supply.
ISDN phones can obtain power by themselves or through the remote PBX. By default, the 2BST (BRA) card does not provide power when the AR router is connected to an ISDN telephone. If power supply is required, run the remote-power enable command.

system-view
[Huawei] voice
[Huawei-voice] port bra 3/0/0
[Huawei-voice-bra3/0/0] remote-power enable
- The phone pin assignment is incorrect.
The pin assignment of the ISDN phone differs from that of a common network cable. The ISDN crossover cable is often used to connect the AR router to the ISDN phone.
If the ISDN phone obtains power supply and the pin assignment is correct but the fault persists, contact Huawei technical support personnel.

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