What is the drawback of configuring Policy-Based Realm Bridging (PBRB) without the assistance of Header Manipulation Rules (HMRs)?
Topology hiding is incomplete.
The configuration requires a home realm to be defined, which can make privacy harder to achieve.
The configuration requires you to enable SIP-NAT bridging, which is complex.
The architecture is simple, and really designed for lab environments.
The performance is poor relative to other models.
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