Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] UAC ( user agent client) UAS (user agent server) UDP (User Datagram Protocol) 2nd UDP datagrams, reliability of UDP overhead UDP packet underscore (_), beginning pattern mask uninterruptible power supply (UPS) 2nd universal serial bus (USB) unload command, Asterisk CLI UPDATE method, SIP UPS (uninterruptible power supply) 2nd URI (Uniform Resource Indicator) resolution of SIP using USB (universal serial bus) USB handsets 2nd 3rd user agent client (UAC) user agent elements, SIP user agent server (UAS) User Datagram Protocol (UDP) user input before implementation |