Call Silent issue for customer side, not at agent side.

In order to reduce the time taken for the dialer to deliver the call to an available agent, the following best practices are recommended:

• Ensure there are sufficient agents logged in to the queue.
• Turn off Answering Machine Detection (AMD) in the campaign.
• (If possible) Remove any “Play prompt” blocks from the contact flow prior to transferring the call to the queue.
• Remove any “Play prompt” blocks from in the agent and customer whisper flow.
• Enable Auto Answer setting on agent CCP.
• (If possible) Minimize the geographical distance between the locations of the Amazon Connect instance of the agent and your customer. See additional documentation on agent and workstation requirements.
• (If possible) While creating the segment file for Pinpoint, add the data that is required for routing logic and agent screen pop and avoid dips to Lambda functions to extract additional information prior to connecting to an agent.
• To achieve lowest call connection latencies, use outbound campaigns to make hundreds of thousands of continuous calls (e.g., to mimic your production environment). Latencies will be relatively higher when making a handful of campaign calls (e.g., when testing).

To know more about the Best practices for running outbound campaigns, Kindly refer Amazon Connect – Best practices for running outbound campaigns