Unstructured Supplementary Service Data (USSD), sometimes referred to as "quick codes" or "feature codes", is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator's computers.

USSD is a basic session-based service. USSD provides menu-based real-time applications. USSD's full form is Unstructured Supplementary Service Data. USSD sends a string to the home network and vice versa. MMI code or USSD Code identifies and converts a USSD call to GSM MAP protocol messages.

USSD (Unstructured Supplementary Service Data) USSD is a kind of protocol (Supplementary Service protocol) that is designed for a UE to communicate with the service provider's computer. It was originally designed for GSM cellular communication and now is being used in WCDMA network as well.

2009年10月17日 · 户可将要呼出的号码通过USSD字串（*101*+4470003 66366#）发到SICAP后，再由SICAP回叫该 用户，并把他接通到“4471000366366”号码上。 目前基于USSD业务的电信产品主要有：（1） SEMA Group的Sema Vision USSD网关，已用于香港数码通，实现商品化并投入实际运营的USSD 平台；

USSD (Unstructured Supplementary Service Data) is a Global System for Mobile Communications protocol that is used to send text messages. USSD is similar to Short Message Service (SMS). USSD uses codes made up of the characters that are …

2023年11月9日 · ussd与短消息业务（sms）都是通过网络的信令通道传递的。 不同之处在于短消息属于存储转发方式， USSD 则属于面向对话方式。 当用户访问 USSD 业务时，该对话通路保持连接，直到对话结束。

2023年2月7日 · 已以下指令为例 已知发送 USSD 的格式为：Send USSD aaaxxxxxxxxxxxx*yyyyyyy# ;Fetch:==:SEND USSD SEND 801200001F ASSERT D01D81030112008202818305008A100F2A5C0DA782C5

USSD codes are communication protocols used across GSM cellular networks, allowing instant interaction. They are crucial in regions with low internet connectivity, providing access to digital services. Their main uses include balance inquiries, recharging mobile credits, and …

The USSD operations are defined in TS 24.090 [10]. The UM field of an USSD String contains the Response Packet. The Response Packet shall be coded as the generic Response Packet described in TS 102 225 [9]. In the Response Packet, the Response Packet Identifier (RPI) value is ’04’ and the Response Header Identifier (RHI) is a Null field.

2023年12月19日 · Unstructured Supplementary Service Data (USSD) is a protocol used in telecommunications to send text messages between a mobile phone and an application program in the network. It's a technology that allows interactive communication between the user and the service provider's computer.