My call dropped in the middle I was talking, I might hear fast busy or just dead air. Please check the following points to solve this issue;
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Calls dropping at specific intervals (10 min, 30 minutes).
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Check the SIP session timers.
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Uncheck “Use Session Timer” from SIP configuration. SIP → Select the name from SIP Configuration menu → Session Timers
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Call dropping within the first minute – missing ACK in Invite. Check NAT configuration.
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Maximum Call time exceeded, many service providers set a limit on the maximum duration for any call passing through their system. Double check with your service provider.
Please check the following wiki for more troubleshooting steps; FreeSBC Troubleshooting Guide