Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Voicemail messages have a lower playback volume than Cisco Unity system prompts

Core Issue

The signal is being boosted at the voice gateway or, for Cisco Unity versions without Automatic Gain Control (AGC), the Cisco Unity-CM TAPI service provider (TSP) wave gain playback and record settings are possibly set too low.


To resolve this issue, perform these steps:

  • If only outside callers are affected, check the voice gateway gain and attenuation levels. Refer to the the appropriate documentation for your configuration in Cisco Gateways for instructions on how to adjust attenuation and gain. For Cisco IOS  Software, use a positive dB value on the input gain command applied to the appropriate voice port to boost the signal if necessary. 

  • If all calls are affected, perform these steps: 


For more information on volume distortion issues, refer to Audio Decision Tree for Cisco Unity.

Unity Version

Unity 2.x, Unity 3.x, Unity 4.x