Good evening Carlos. I've found an example on git repository where you have additional information. For a credit of 50, a discount per second of 0,5, a initial_pulse of 30 and final_pulse of 6 .. # if only one call is established, that call should last 1m, 36s Now It makes sense to me. Thanks and regards. -- Eduardo Lejarreta. De: Eduardo Lejarreta [mailto:lejarreta.e@sarenet.es] Enviado el: jueves, 06 de junio de 2013 11:40 Para: 'sr-users(a)lists.sip-router.org' Asunto: cnxcc developer module pulse concept Good morning Carlos. On cnxcc_set_max_credit() function I don't understand the concept "pulse" (sure it's something easy but I'm a not aware about this matter) Could you please explain it in an example? Thanks and best regards. -- Eduardo Lejarreta.