Step 1 Check whether the IP phone has been registered with the SoftCo.
If the phone displays the information indicating network disconnection, check the network cable.
If the phone displays the information indicating that the network is in good condition but is unregistered, check the configuration of the IP phone, SIP server, and port number.
If the registration requires password authentication, verify that the password is correct.
Step 2 Log in to the SoftCo and run the show sipue eid command to view the IP phone configurations. This command output also contains the information about whether the IP phone has been registered.
The information contains the IP address that the phone is using. Verify that the IP address is the same as the actual IP address of the IP phone. If the IP addresses are different, the number configured on this IP phone may duplicate with that on another IP phone. In this case, configure another number for the IP phone.
Step 3 If the fault persists, contact Huawei technical support engineers.