The encryption mode options are:
• Force encrypted: All media to and from the zone/subzone must be encrypted. If the target system/endpoint is configured to not use encryption, then the call will be dropped.
• Force unencrypted: All media must be unencrypted. If the target system/endpoint is configured to use encryption, then the call may be dropped; if it is configured to use Best effort then the call will fall back to unencrypted media.
• Best effort: Use encryption if available, otherwise fall back to unencrypted media.
• Auto: No specific media encryption policy is applied by the Expressway. Media encryption is purely dependent on the target system/endpoint requests. This is the default behavior and is equivalent to how the Expressway operated before this feature was introduced.
Encryption policy (any encryption setting other than Auto) is applied to a call by routing it through a back-to-back user agent (B2BUA) hosted on the Expressway.
Available modes are "Force encrypted, Force unencrypted, Auto and Best Effort".
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