What are benefits of using SIP AGs as voice gateways

The AR router supports the SIP AG function to provide VoIP services, which brings the following benefits:
-Lower costs: Traditional call and fax services use the circuit switching mode, in which each call session occupies a circuit. Therefore, fees are high, especially when users make long-distance calls. VoIP services use the packet switching mode, and call fees are much lower.
-High call quality: SIP AGs ensure call completion rate, voice quality, and service types by configuring QoS.
-Smooth upgrade/capacity expansion: A VoIP system is compatible with the existing telephony systems and office platforms, and the service capacity can be increased when the enterprise scale expands.

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