Number 1 service based on Softswitch

A Softswitch-based No. 1 service refers to a user's application for a unique personal communication number to transfer future calls to a specified number of terminals using the softswitch network, A call can be initiated on any terminal using a single-digit communication number as the caller ID.
You can set your business through web pages, voice interactions, or the Software Terminal Management Interface (optional.
(1) system composition
The No. 1 Communication System Based on the softswitch network includes:
No. 1 business application server:
Provides business logic of No. 1, stores business-related data, and provides business management functions.
Softswitch
As a core control device, Softswitch is a scalable carrier-level platform. It is located in the control layer of the NGN network and provides call and Connection Control, protocol processing, service provision, network resource management, billing, authentication, and other functions for a variety of services.
Media Resource Server:
Entities that provide voice interaction functions, such as the radio number.
Relay gateway TGW ):
Provides the ability to communicate with PSTN networks.
(2) Business functions
The Softswitch-based No. 1 Communication Service can easily implement the functions of the traditional No. 1 Communication Service: sequential and simultaneous ringing.
Ordered ringing
When a user calls a pass number, the user calls the number sequentially from the first transfer number to the last transfer number according to the pass number table set by the user; if the previous number fails to respond without a response, is busy, or fails to be routed, the next number is automatically continued until the last number is reached. The user's No. 1 pass number is the first transfer number of the forward call code table. You can set multiple call numbers.
Simultaneous ringing
When you call a single phone number, call all phone numbers at the same time according to the same vibration number table set by the user. When a user answers any of these calls, the other terminals automatically stop the ringing. The user's No. 1 pass number is the first transfer number of the same vibrating number table. You can set multiple same-vibration numbers.
Compared with the traditional PSTN, the softswitch network is more convenient to interwork with the Internet. Traditional No. 1 communication services, similar to the setting of zhenshun call numbers, are generally completed through IVR interaction. The No. 1 Communication Service under Softswitch not only supports IVR interaction, you can also use the B/S mode to complete the settings through WEB page settings or C/S mode through the terminal, giving you more options.
(3) Call Control
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The SoftSwitch and No. 1 application servers are generally interconnected through the SIP protocol, and the Access Gateway is generally interconnected through the H.248 or Megaco Protocol.
As the SIP proxy server, Softswitch can distinguish between common call and one-stop call based on the call information, and switch the call to the One-Stop Application Server. The Application Server of No. 1 provides the execution and management of No. 1 services.
Common calls follow the existing call procedures and standards.
One-to-one call can be divided into two types: Synchronous call and forward call. When a user calls one-to-one call, the softswitch switches the call to the application server. The application server obtains user data based on the called Number: Same-vibration or forward call, and the transfer number table. The application server will initiate a call to the same vibration number according to the user settings, or call the number table in a certain order and at a certain interval. All subsequent messages of a call are sent to the application server. The application server processes the messages based on the feedback. The application server will also generate corresponding records for calls.
4. signaling process
Figure 4 PSTN user A calls user 1, which is connected to POTS user B and SIP User C under the AG of the softswitch domain. The SoftSwitch and Application Server are connected by the SIP protocol, softswitch and AG, SoftSwitch and TG are connected with H.248 protocol. As you can see, user B and user C are ringing at the same time, user C is picking up and responding, and the Application Server cancels the ringing on user B. When both parties call and the call ends, user C is suspended and the system releases the connection.
Figure 5 PSTN user A calls user 1 and calls POTS user B and SIP User C under the softswitch domain AG. The SoftSwitch and Application Server are connected by the SIP protocol, softswitch and AG, SoftSwitch and TG are connected with H.248 protocol. As you can see, user B first rings the bell. After the specified time is reached, the app server cancels the ring on user B and then calls user C. User C is disconnected and the call ends. User C is suspended and the system releases the call.
Figure 4: Same-vibration signaling Diagram
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Figure 5: Call-forward signaling Diagram
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