The adhan and iqamah are sunnah muakkidah for:
Fard salaat and jumah
For ada (on time) and qaza (after time)
For the one who is in his hometown and a musafir (traveller)
For men, but it is makrooh for women
It is makrooh:
To call the adhan in a singing tone;
Call the adhan without being in wudhu or ghusl;
By a boy who cannot understand;
By an insane or drunk person
By a woman;
By a faasiq;
By one sitting
Talking during adhan and iqamah;
To give adhan and iqamah of zuhr salaat in a town only on Fridays.
The time between the adhan and iqama of Maghrib is the time that it takes to read three ayats of quran, or the time it takes to walk three steps.