Update APIproposal_5GNewCalling_ChinaMobile.md

The API summary and Technical viability has been revised.

documentation/API proposals/APIproposal_5GNewCalling_ChinaMobile.md

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 | API family name | 5G New Calling |
 | API family owner | China Mobile |
-| API summary |Utilizing IMS Data Channel technology (specified in 3GPP TS 26.114, TS 23.228 and GSMA NG.134), 5G New Calling introduces a richer feature set natively on the mobile device, such as content sharing, interactive visual menu, etc. These new features bring a new calling experience to consumers while opening up new business possibilities for Brand/Vertical service provider. Brand/Vertical service provider can upgrade their  phone customer service to 5G New Calling customer service. With the rich feature set of 5G New Calling, they can provide better service to customers and also improve service processing efficiency. The 5G New Calling API provides ability for Brand/Vertical service provider to establish 5G New Calling communications with the other party (e.g. a subscriber of MNOs or a Vertical application client). <br><br>Here are two example use cases:<br>Use Case 1:<br>Content sharing: With 5G New Calling customer service, the customer service representatives could share some relevant content with the consumers after obtaining the their permission. For example, the representatives could share an introductory video of a product in which the consumer has expressed interest, allowing the consumer to gain deeper insights into the product, or the representatives could share documents such as booking confirmations directly with the user during the call. <br><br>Use Case 2:<br>Interactive visual menu : With 5G New Calling customer service, Brand/Vertical service provider could provide customers with interactive visual  menu to enrich the way customers communicate with customer service staff. Customers could query the bill through the menu, or access the electronic signature interface  through the menu for signature confirmation, etc. This could improve the efficiency of customer service and enhance the customers experience.|
-| Technical viability | This API requires the availability of MNO's network with "IMS Data Channel" feature of Rel-18 and Rel-19.|
-| Commercial viability | This API provides Brand/Vertical service provider with the ability to establish/modify/terminate 5G new calling.|
+| API summary |5G New Calling introduces a richer feature set beyond traditional voice and video calls. For example, it can convert spoken words into text and display it on the user's screen or directly send text to the user, etc. These features can be categorized based on their network requirements: those based on voice/video call and those requiring IMS Data Channel (DC, specified in 3GPP TS 26.114, TS 23.228 and GSMA NG.134), and the latter also necessitates terminal support for IMS DC. Although 5G New Calling could provide a rich variety of functions, at present, we hope to focus on a typical usage scenario first. Therefore, in this API family, we will focus on providing APIs for both voice/video call-based and IMS DC-based "AI Translation". Specifically, it mainly includes APIs for establishing a basic 5G New Calling connection and APIs for invoking the "AI translation" service.<br><br>Here is the example use case:<br>AI Translation: Enterprises can provide AI-based translation services for cross-language communication and assist the hearing impaired in scenarios where there is a language barrier. When a user subscribed to AI translation initiates a call, the operator network will notify the enterprise of the call initiation event through a call event notification API. At this point, the enterprise can instruct the operator network to initiate AI translation for the call via the AI translation function invocation API. Upon receiving the enterprise's request, the operator's network translates the user's voice into the specified language and displays the translated subtitles to the user in real time.|
+| Technical viability | This API requires the MNO's network to support audio and video calls based on VoLTE and VoNR. If IMS DC-based "AI Translation" is to be used, it also requires the MNO's  network to support "IMS Data Channel" feature of Rel-18 and Rel-19.|
+| Commercial viability | This API provides Brand/Vertical service provider with the ability to establish/modify/terminate 5G new calling service.|
 | YAML code available? | NO.|
 | Validated in lab/productive environments? | YES. <br>China Mobile has conducted pilot validations on  productive environments.|
 | Validated with real customers? | NO.<br> China Mobile only has validated with pilot users.|