What are benefits of using SIP AGs as voice gateways

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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.

Other related questions:
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.

What are SIP AGs and PBXs, and what are the differences between them
Access devices on the IP Multimedia Subsystem (IMS) provide various access modes and convert various services into a uniform format that can be transmitted. On the IMS, an access device is called access gateway (AG). AGs play an important role on the IMS and are connected to users. AGs and media gateway controllers (MGCs) use Session Initiation Protocol (SIP). SIP-based AGs are called SIP AGs. A traditional private branch exchange (PBX) manages the incoming and outgoing calls of an enterprise. It connects the enterprise to the Public Switched Telephone Network (PSTN) and provides services for devices such as telephones, fax machines, and modems. It allows users in the enterprise to call each other using extension phones and routes inter-office calls to the PSTN through a trunk line. Traditional PBXs cannot meet the requirements of computer telephony integration (CTI) and voice over IP (VoIP). In addition, these PBXs are expensive and do not use standard and open platforms, creating difficulties in interconnecting PBXs of different vendors. IP PBXs overcome the limitations of traditional PBXs. IP PBXs are based on the IP protocol and provide both local exchange and IP user access functionality. IP PBXs integrate the voice communications system of an enterprise into the enterprise's data network so that the enterprise can build a uniform voice and data network connecting branches, offices, and staff around the world. The AR1200/2200/3200 can function as a PBX to provide traditional PBX functions and IP PBX functions. SIP AGs and PBXs have the following differences: -PBXs have two functions. PBXs can serve as switching devices on a private network to locate voice users' addresses and process other services. PBXs also allow users on the private network to access the IMS or PSTN through SIP trunks. -SIP AGs provide only the second function of PBXs. SIP AGs can be considered to be a plain old telephone service (POTS) that can register with the IMS using SIP trunks. PBXs use SIP trunks to register with other SIP servers. SIP AGs register with the IMS using POTS user numbers. PBXs and SIP AGs provides the same services. However, PBXs provide the services by themselves.

How many DID numbers does a voice gateway support?
For the SoftCo and U1900 series voice gateways, DID numbers are long numbers of users (PSTN numbers allocated by the carrier). You can configure a long number for each user number created on the device. The maximum number of DID numbers is limited by the device performance and user license. Maximum number of users supported by each device: SoftCo 3500: 100 SoftCo 5500: 300 SoftCo 5816: 800 SoftCo 7500: 1000 SoftCo 9500: 10,000 U1910: 100 U1911: 100 U1930: 300 U1960: 1000 U1980: 10,000 U1981: 20,000

The value of the OceanStor 9000 InfoAllocator feature
The value the InfoAllocator feature is in managing storage resources. This feature enables administrators to allocate storage space or files to user groups and users based on service requirements.

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