Codec 15 is based on Codec12 protocol. Codec 15 is used when message timestamp and device IMEI is enabled and its original Teltonika protocol for device -> server communication over GPRS messages.
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Codec 15 relies on the Codec12 protocol and is employed when both message timestamp and device IMEI are enabled. It serves as the original Teltonika protocol for communication from the device to the server via GPRS messages. This protocol is exclusively applicable to FMX6 professional devices.