If you are on a Cisco UCM PBX, and notice your call recordings are not working.
Often the underlying issue is the built in bridge needs to be enabled on Cisco's side. This is a feature unique to Cisco UCM as they have a dedicated bridge to the phone to handle call recordings.
Enable Built In Bridge
Log into Cisco Unified CM Administration.
Navigate to Cisco Unified CM Administration > Device > Phone > (DEVICE) and ensure the BiB is enabled. If it is Off, use the drop-down box to turn it On.
If this setting is set to default, navigate to Cisco Unified CM Administration > System > Service Parameters > Select your publisher > Cisco CallManager > Search for “Built in Bridge Enable”.
If the default for this is “Off” it means the phones likely have their built in bridges disabled.