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A SIP user agent (UA) is a logical network endpoint used to create or receive SIP messages and thereby manage a SIP session. A SIP UA can perform the role of a User Agent Client (UAC), which sends SIP requests, and the User Agent Server (UAS), which receives the requests and returns a SIP response. These roles of UAC and UAS only last for the duration of a SIP transaction.

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FXS ports are standard analog telephony interfaces that are used in Public Switched Telephone Network (PSTN) networks. The FXS interface is the modular wall plug that connects the telephone to the central office (CO) of the PSTN. The CO delivers power, dial tone, and ringing capabilities by way of the FXS interface.

Warning
title Warning
After a reboot or refresh from a configuration change, the FXS ports may report as "Unlicensed". This means the hardware is still starting up and loading the configuration, or there is cached web page data in the browser. To resolve this issue, either wait 1 to 2 minutes and refresh the page, or configure the ports and submit.

Transmit/Receive Gain

You can configure the transmit and receive gain setting for each FXS port on the

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. Most devices operate with the default 0dB Rx gain setting, but you can adjust the setting to interoperate with user endpoints such as phones, fax, or key systems.
When an endpoint device is hooked to the FXS port, it may be necessary to adjust the receive gain settings if the port is unable to detect the digits sent from the device. Adjust the gain in steps of -4dB using the FXS port Tx/Rx gain settings until the digits are detected.

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