[Serusers] User update on SER

Hey, How does SER updates a user location? For exemple, upon the first REGISTER message, it keeps the location of the user in a database or so. But this entry has a expire time. How is this expire time updated? SER updates it upon receiving another SIP REGISTER or OPTIONS messages? I know that this update is done, but I am quite confusing about how it is done. Thanks Felipe -- Master Student - Electrical Engineering Department Computer Engineering and Telecommunications Research Group Universidade Federal de Minas Gerais - Brazil "Come to me, all you who are weary and burdened, and I will give you rest." Matthews 11:28 "Failure is the opportunity to begin again more intelligently." Henry Ford