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Companies connect their Private Branch Exchanges (PBXs) to Amazon Chime Voice Connector using the standard-based Session Initiation Protocol (SIP) for call signaling and real-time-transport protocol (RTP) for voice.

While small companies (<100 seats) will typically connect their PBX directly to the Chime Voice Connector, most mid-to-large customers (500-1000+ seats) will deploy a session border controller (SBC) at the interface between the corporate LAN and the service provider IP network (Enterprise edge). The SBC acts as a specialized firewall that grants access only for calls coming from the enterprise’s trusted service provider. SBCs also prevent DDoS attacks and assists with encryption and NAT traversal.

For more details regarding deployment scenarios see this white paper.

See the Amazon Chime Administrator's Guide for more details on how to setup Voice Connector. https://docs.aws.amazon.com/chime/latest/ag/voice-...