The five daily obligatory prayers and Jumu‘ah have a prescribed adhan; iqamah announces their commencement.
For one missed obligatory prayer, both calls are given. In a series of missed obligations, both are given for the first and there is a choice for the rest.
Eid, funeral, and voluntary prayers do not use the regular daily-prayer adhan.
This distinguishes time announcement, commencement of prayer, and making up missed obligations.