Why ISDN phone is unavailable

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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.

Other related questions:
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.

Why is an ISDN phone unavailable
An ISDN phone may be unavailable because of the following reasons: -The ISDN phone power is not supplied properly. An ISDN phone's power can be supplied by itself or using the remote PBX. By default, no power is supplied to the AR's 2BST (BRA) board connecting to the ISDN phone. To supply power to the 2BST (BRA) board, run the remote-power command. The detailed configuration is as follows: system-view [Huawei] voice [Huawei-voice] port bra 3/0/0 [Huawei-voice-bra3/0/0] remote-power enable -The cable sequence is incorrect. In most cases, ISDN crossover cables are used to connect the AR and an ISDN phone. If the fault persists, contact Huawei technical support personnel.

Can the ISDN phone provide 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

Can an ISDN phone supply power to itself
An ISDN phone's power can be supplied by itself or using the remote PBX. By default, no power is supplied to the AR's 2BST (BRA) board connecting to the ISDN phone. To supply power to the 2BST (BRA) board, run the remote-power command. The detailed configuration is as follows:
 system-view 
[Huawei] voice 
[Huawei-voice] port bra 3/0/0 
[Huawei-voice-bra3/0/0] remote-power enable

Reason for unavailability of the secondary gateway
Question: Question: When NEs A and B are forcibly switched to secondary GNE C, the NEs become unreachable, namely the secondary gateway is not available. Analysis: 1. When the primary GNE is used, the NEs are reachable. This means that the system control boards and software are normal, as well as the communication parameters. 2. The maximum number of route hops is 20, which is smaller than the actual value, resulting in the failure in backup route search. 3. The maximum number of route hops should be set to the default value 64, and the issue will be resolved. Root cause: The maximum number of route hops was set to 20 for NEs A and B. The actual number of hops between NEs and the GNE is greater than 20, resulting in the failure in locating the backup route and communication. Answer: The maximum number of route hops should be set to the default value 64, and the issue will be resolved. Suggestion and conclusion: Common causes for unreachable NEs are: incorrect communication parameters (NEID, subnet mask, or ECC modes), constant reset of the system control boards resulting in communication failures, and excessively large scale of the automatically extended ECC resulting in network instability.

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