A method for supporting a radio call over an alternative connection to an alternative network using remote scan and priority operations, comprising an electronic processor in a subscriber device for: determining that a land mobile radio connection to a land mobile radio, LMR, network is unavailable for the subscriber device; determining that the alternative connection to the alternative network is available for the subscriber device, the alternative connection different than the land mobile radio connection; connecting the subscriber device to the alternative network using the alternative connection, based on the determination that the land mobile radio connection is unavailable and the determination that the alternative connection is available; sending a first scan list from the subscriber device over the alternative connection, the first scan list comprising a first talkgroup entry associated with a first talkgroup, and also comprising a list of a plurality of talkgroup entries, wherein each talkgroup entry in the plurality of talkgroup entries is associated with a talkgroup; each talkgroup entry in the plurality of talkgroup entries comprises: an identifier associated with the talkgroup; a priority level associated with the talkgroup; and the plurality of talkgroup entries comprises the first talkgroup entry associated with the first talkgroup; receiving a first call notification over the alternative connection after sending the first scan list over the alternative connection, the first call notification associated with the first talkgroup; joining, based on receiving the first call notification, a radio call associated with the first talkgroup over the alternative connection; generating, by the subscriber device, a second scan list based on the first scan list, by adding removing or otherwise using information from the first scan list; and sending the second scan list over the alternative connection. determining that a land mobile radio connection to a land mobile radio, LMR, network is unavailable for the subscriber device; determining that the alternative connection to the alternative network is available for the subscriber device, the alternative connection different than the land mobile radio connection; connecting the subscriber device to the alternative network using the alternative connection, based on the determination that the land mobile radio connection is unavailable and the determination that the alternative connection is available; sending a first scan list from the subscriber device over the alternative connection, the first scan list comprising a first talkgroup entry associated with a first talkgroup, and also comprising a list of a plurality of talkgroup entries, wherein each talkgroup entry in the plurality of talkgroup entries is associated with a talkgroup; each talkgroup entry in the plurality of talkgroup entries comprises: an identifier associated with the talkgroup; a priority level associated with the talkgroup; and the plurality of talkgroup entries comprises the first talkgroup entry associated with the first talkgroup; each talkgroup entry in the plurality of talkgroup entries is associated with a talkgroup; each talkgroup entry in the plurality of talkgroup entries comprises: an identifier associated with the talkgroup; a priority level associated with the talkgroup; and the plurality of talkgroup entries comprises the first talkgroup entry an identifier associated with the talkgroup; a priority level associated with the talkgroup; and the plurality of talkgroup entries comprises the first talkgroup entry associated with the first talkgroup; receiving a first call notification over the alternative connection after sending the first scan list over the alternative connection, the first call notification associated with the first talkgroup; joining, based on receiving the first call notification, a radio call associated with the first talkgroup over the alternative connection; generating, by the subscriber device, a second scan list based on the first scan list, by adding removing or otherwise using information from the first scan list; and sending the second scan list over the alternative connection.