Emergency Hot Microphone
The Hot Microphone allows you to talk without pressing the PTT button during Emergency Operations. The
transmission continues for a provisioned amount of time. Pressing the PTT button before the Hot Microphone time
expires ends the Hot Microphone operation. Then normal PTT operation in Emergency group call takes over (that is,
the transmission is ongoing for the time the PTT button is held).
If a talk permit is granted to another member of the group, the Emergency Call received tone is played. If configured,
the radio automatically attempts to get talk permit again.
Disaster Alert
Disaster Alert call is a broadcast emergency call initiated by the radio in all modes, with emergency pre-emptive
priority that everyone in a broadcast area can hear. This feature is specifically designed for catastrophic situations,
such as earthquakes, and has the highest priority over other calls.
Your radio can only receive Disaster Alert calls
During Disaster Alert, other functionality is impacted:
• When Disaster Alert begins, any other ongoing services are terminated.
• No other services can interrupt this type of call.
• Hot Mic functionality cannot be used.
• Speech can only be in Clear mode, even if any of the encryption services are enabled. The only exception is E2E
Encryption.
Note: Not all infrastructures support this feature. Please consult with your service provider before enabling
this feature.
Security Services
The radio provides TETRA security features as described in the TETRA Security ETS 300 392-7 standard, TTR
001-11 TIP, and TTR 001-13 TIP.
Terminal Equipment Identity
The Terminal Equipment Identity (TEI) is unique identification number programmed in the radio at the factory and
cannot be later modified.
Authentication
Authentication establishes a level of a trust between a radio and SwMI. It is a challenge-response result protocol
between two parties based on their common knowledge of a secret key (K) to verify each others identity.
The SwMI authentication centre (AuC) provides a single K for authentication, which is shared only with the radio.
Authentication is always initiated by the SwMI, the radio can also authenticate the SwMI (if set by the service
provider).
Air Interface Encryption
The radio supports TETRA Air Interface Encryption (AIE) using the standard TETRA public encryption algorithms,
as defined in TETRA Security ETS 300 392-7, TEA1, TEA2 and TEA3. The focus of cryptography in TETRA is the
encryption key. TETRA AIE provides 12 000 000 000 000 000 000 000 000 key combinations.
TETRA TMO has three classes of encryption:
• Class 1 — clear (none).
Services and Features | 33
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