Скачать или смотреть Basic Call and Recording flow on Oracle SBC

Here is a step-by-step breakdown of the call flow and the components involved:

1. The Call Originates (Phone to PBX)
The process begins on the left with the Phone (User End-point).

Signaling & Media: When a user dials a number, the phone sends signaling (SIP) and voice media (RTP) to the local PBX (Private Branch Exchange).

Role of PBX: The PBX acts as the internal "switchboard," managing internal extensions and routing the call toward the external network.

2. Gateway to the SBC (PBX to Oracle E-SBC)
The PBX routes the call toward the Oracle Acme Packet E-SBC (Session Border Controller).

Security Border: This is the most critical point. The E-SBC sits at the edge of the enterprise network, acting as a "firewall" specifically for voice traffic.

Protocol Interworking: If the PBX uses a slightly different version of SIP than the Service Provider, the SBC performs "SIP Normalization" to ensure they can talk to each other.

3. Session Recording (SIPREC)
The red line leading to the servers at the bottom represents SIPREC (Session Recording Protocol).

Function: This indicates that the Oracle SBC is actively "forking" the media. While the call continues to its destination, a copy of the conversation is sent to a recording server.

Use Case: This is essential for call centers, compliance, and quality assurance.

4. Connecting to the Cloud (SBC to SIP Trunk)
The SBC then passes the traffic to the SIP Trunk (represented by the cloud).

NAT Traversal: The SBC handles Network Address Translation (NAT), ensuring that the voice packets find their way back from the public internet to the correct private internal IP of the phone.

Security: It hides the internal network topology from the public internet to prevent hacking or toll fraud.

5. Termination (SIP Trunk to Outside Party)
The SIP Trunk provider routes the call through the public network to reach the Outside Party (the person icon on the far right).

The green wavy lines throughout the diagram represent the RTP Media Flow (the actual sound of the voices), while the straight arrows generally represent the SIP Signaling (the setup and teardown of the call).

Summary of the Oracle SBC's Role: In this specific flow, the Oracle Acme Packet E-SBC acts as the intelligent gatekeeper, managing security, recording (via SIPREC), and seamless connectivity between the private office PBX and the public SIP provider.