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Voicemail messages have a higher volume than Cisco Unity system prompts

Core Issue

If the problem affects only messages from outside callers, the issue may be as simple as signal gain at the voice gateway. If all calls are affected, then for Cisco Unity versions without Automatic Gain Control (AGC), the Cisco Unity-CM Telephony Application Programming Interface (TAPI) Service Provider (TSP) wave gain playback and recording settings may be set too low.


To resolve this issue, perform these steps:

  1. If only outside callers are affected, check the voice gateway gain and attenuation levels. For instructions on how to adjust attenuation and gain, refer to the the appropriate documentation for your configuration at Cisco Gateways.   

    For Cisco IOS  Software, use a negative decibel (dB) value when issuing the input gain command that is applied to the appropriate voice port to boost the signal if necessary.

  2. If all calls are affected, perform these actions:    


    For more information on resolving volume distortion issues, refer to Audio Decision Tree for Cisco Unity 2.46 and 3.0(x).