[Serusers] ser to sip provider

Hi, i attempt to connect ser to a sip provider with user + password authentication. if i get it right, i have to load the uac modul and insert following line: modparam("uac","credential","user:sip-provider-ip:password"), but i can't find the uac modul .. i hope anybody can help me .. another way i tried is this one: route[x] { rewriteuri("username@sip-provider-ip"); rewriteuserpass("username:password"); rewritehost("sip-provider-ip"); forward("username:password@sip-provider-ip"); } but it worked either. it comes always up with: get_connection(): Connection not found in the pool .. kind regards, julia heller -- Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer