What enhancement for Session Manager was introduced in Avaya Aura 8?

The enhancement introduced for Session Manager in Avaya Aura 8 that focuses on SIP call preservation during server failure is crucial for maintaining service reliability and continuity. This feature allows active SIP calls to persist even in scenarios where the Session Manager experiences a failure. By implementing SIP call preservation, users are able to experience less disruption during server issues, as their conversations can continue seamlessly without the need for renegotiation or drops.

This enhancement is especially significant in environments where reliability is paramount, such as in enterprise communications. By preserving ongoing sessions, it minimizes the impact of server failures on users, thereby enhancing the overall user experience and ensuring that critical communications remain uninterrupted.

The other options do not directly enhance the resilience and reliability of Session Manager in the same way, making the option regarding SIP call preservation the most impactful upgrade in this context.