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No audio on a Cisco phone

You can't hear the caller, or they can't hear you.

Cisco device

Rule out the handset, then the network.

Steps

  1. Try the handset, speaker and headset.If only one fails, it's that device or cable.
  2. Check Mute isn't on.
  3. If outside calls have one-way audio, turn off SIP ALG on your router.
  4. Ask your provider to check the call if internal calls work but outside calls don't.
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