What is a UCP/EMI connection?

The Universal Computer Protocol / External Machine Interface (UCP/EMI) protocol is often used by GSM service providers for IP SMS connectivity.

The currently used protocol versions (v3, v3.5, v4.0) can be used to transfer high volumes of SMS traffic. It is used for both premium rate and normal rate SMS messages. One of the advantages of using UCP connections is that you can specify the sender address of the message. The sender address can be a custom phone number or a short word containing alphanumeric characters. Another advantage of UCP is that it allows sending messages of every type the GSM network can carry. It can be used to send binary SMS messages (operator logos, ringtones), WAP Push messages, as well as other types of messages.

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