Methods and systems for adding a mobile radio to a talkgroup

A first mobile radio that is a member of a talkgroup, the first mobile radio comprising:

• a first wireless communication interface;
• a second short-range communication interface;
• a processor;
• and
• data storage containing instructions executable by the processor for causing the first mobile radio to carry out a set of functions, the set of functions comprising:
• detecting an add-mobile-radio trigger;
• in response to detecting the add-mobile radio trigger, generating an add-mobile-radio request and sending the add-mobile-radio request to a first radio-network switching system over the first wireless communication interface;
• subsequent to transmitting the add-mobile-radio request to the first radio-network switching system, receiving an add-mobile-radio response from the first radio-network switching system over the first wireless communication interface, the add-mobile-radio response including an add-mobile-radio authentication token;
• providing the add-mobile-radio authentication token to a second mobile radio over the second short-range communication interface;
• and
• subsequent to providing the add-mobile-radio authentication token to the second mobile radio, communicating with the second mobile radio via the talkgroup.