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The call recording of SIP lines requires a port mirroring setup, which enables the monitoring of network packets. The port mirroring allows the SIP traffic going through one port on your managed switch to be copied to another port, for packet analysis.
Your telephone system will be connected to one port on your managed switch sourcing the SIP traffic, which needs to be configured to send a copy of all the SIP packets to another port connected to one of the network cards of the Echo server.
The image below illustrates the general configuration involved in port mirroring.
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