[SR-Users] 407 Proxy Authentication Required

Hi all...I need help ... I am using Kamailio as SIP server... I tried to do call between two sip clients (MyMonster)..The clients can register with kamailio without any problems. But when I try to do call between two clients, It doesn't work. Once the kamailio gets the first invite from the client, it directly replies with "407 Proxy Authentication Required". In the kamailio.cfg the domain is "kamailio.test" in the kamctlr I also  use "kamailio.test" as SIP domain.. In the Log of Kamailio I see this: 2(16979) DEBUG: corex [corex_lib.c:189]: corex_check_self(): check self domain match: 0:kamailio.test:0  2(16979) DEBUG: auth_db [authorize.c:476]: auth_check(): realm [kamailio.test] table [subscriber] flags [1]  2(16979) DEBUG: auth [api.c:86]: pre_auth(): auth:pre_auth: Credentials with realm 'kamailio.test' not found  2(16979) DEBUG: auth_db [authorize.c:252]: digest_authenticate(): no credentials  2(16979) DEBUG: auth [challenge.c:127]: get_challenge_hf(): build_challenge_hf: realm='kamailio.test'  2(16979) DEBUG: auth [challenge.c:269]: get_challenge_hf(): auth: 'Proxy-Authenticate: Digest realm="kamailio.test", nonce="Up+EuVKfg42WYOrC87GTm+rvMNFeNe3/BCf5m4A=" Thanks in advance... Medo