On Wed, Mar 04, 2020 at 10:22:31PM +0530, Gaurav Bmotra wrote: I assume you mean a carrier whose gateway authenticates you via username & password digest authentication? If so, yes; the UAC module's "uacreg" facility is for just that -- See https://kamailio.org/docs/modules/5.3.x/modules/uac.html#uac.p.reg_db_url et al -- Alex -- Alex Balashov | Principal | Evariste Systems LLC Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/