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The IP phone speaker volume is soft on calls from a particular voice gateway

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Core Issue

The signal strength is low upon arrival at a particular Cisco IOS  voice gateway, or the gateway artificially lowers it.

Resolution

The signal strength can be raised at the gateway with configuration commands. Complete these steps:

  1. Under the voice port, issue this command:
    voice-port 0/0
      input gain 1
    The shut and no shut commands are required in order to accept the voice port changes.

  2. Change values, place test calls, and adjust the signal as needed. Increase the input gain level by 1dB after each test call until optimal volume is reached.

Refer to these documents for more information:

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