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It is a 3GPP (3rd Generation Partnership Project) technical specification, often used for UMTS and LTE networks.

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Messaging service using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3. 124247

Suitable for high-visibility industrial safety environments to mark necessary personal protective equipment (PPE). 2. Technical Specification (ETSI TS 124 247) It is a 3GPP (3rd Generation Partnership Project)