How do I enable my IP phone to notify the peer party with the busy announcement instead of the ringback tone

The possible reasons are: -The license is not correctly installed. To use the voice PBX function, apply for and install a commercial license. Run the display license state command to verify that the license status is normal. -No valid PBX user is configured. Ensure that the PBX device identifier and PBX user identifier are correctly configured. For details, see the Configure the PBX User in the voice configuration manual. -The DSP resources are insufficient. Run the display voice dsp-dimm state { slot/dsp-index | channel slot/dsp-index/channel } command. The idle item in the command output shows the remaining DSP resources. For example: NOTE: For V200R002C00 and earlier versions, run the display voice dsp-dimm state { slot/dsp-index | channel slot/dsp-index/channel } command to view the usage of DSP resources. For versions later than V200R002C00, run the display voice dsp state { slot/dsp-index | channel slot/dsp-index/channel } command to view the usage of DSP resources. The following uses a version earlier than V200R002C00 as an example: display voice dsp-dimm state 15/0 Symbol: 0-idle $-G.711 busy A-All busy W-Wastage X-fault @-IP loopback *-PCM loopback #-prohibited Channel NO. DSP channel state ---------------------------------------------------------------------- 0000-0049 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 0050-0099 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 0100-0149 00000 00000 00000 00000 00000 000 Total: 128 DSP channel 128 idle, 0 G.711 Busy, 0 All Busy, 0 Wastage, 0 Fault, 0 IP loopback, 0 PCM loopback, 0 prohibited In the preceding information, 128 idle indicates that 128 DSP channels are idle and the current DSP resources are sufficient. If the fault persists, contact Huawei technical support personnel.

When the call waiting function is enabled on an IP phone and at least two lines are configured, the user who initiates a call to the IP phone when it is busy hears the ringback tone. When the call waiting function is disabled, the user who initiates a call to the IP phone when it is busy hears an announcement, indicating that the called party is busy. To disable the call waiting function, perform the following steps: eSpace 7900 series: On the home screen, choose Apps > Preferences > Call Settings > Call Waiting. Press Disable. eSpace 8850: On the home screen, choose Settings > Call Service > Call Waiting. Tap Disable and then tap Save.

Access the phone web page. Choose Call Settings > Auto Answer. Select Enable. In Delay time, enter the delay time. Click Save.

On the web page, choose Preferences > Key Tone. Select Disable. Click Save.

When the called party under the U1900 series voice gateway is busy, the system plays the busy tone to the calling party. If the busy tone is not played, please contact Huawei after-sales engineers for help. The prerequisites for playing the busy tone are as follows: The user does not have multi-call or call waiting service rights and the user's IP phone (if used) cannot enable the call waiting function.