What are the advantages of a SIPAG if it is used as a voice access gateway

A SIPAG has the following advantages if it is used as a voice access gateway:
- Low cost: Traditional telephone and fax services use the circuit switch method, in which communication lines are exclusively used. Therefore, the cost is high when users use toll call services. The VoIP can be achieved if SIPAGs are used as voice access gateways, which can reduce the communication cost.
- Guaranteed voice quality: The call completion rate, voice quality, and service types can be guaranteed with methods such as QoS.
- Smooth upgrade and expansion: SIPAGs are compatible to the existing system and can interconnect with the existing working platform. The capability of a system using SIPAGs can smoothly expand with the expansion of the system scale.

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