On 12/13/2013 04:44 AM, Keith wrote: In general, you should try to avoid this scenario if possible, since it's not exceptionally well-supported in Kamailio. But if you must do this, the 'uac' module does offer you a means of responding to authentication challenges: http://kamailio.org/docs/modules/4.1.x/modules/uac.html#uac.f.uac_auth() You can also use an in-line B2BUA, such as SEMS (with its 'sbc' module), for easier handling of this and other complications which might arise. -- Alex -- Alex Balashov - Principal Evariste Systems LLC 235 E Ponce de Leon Ave Suite 106 Decatur, GA 30030 United States Tel: +1-678-954-0670 Web: http://www.evaristesys.com/, http://www.alexbalashov.com/