\section{Table of Timer Values}

Table \ref{tab:timers} sumarizes the meaning and defaults of the
various timers used by this specification.

\begin{table}[htpb]
\begin{center}
\begin{tabular}{llll}
Timer & Value & Section & Meaning \\
\hline
T1 & 500ms default & Section \ref{sec:transactions:client:invite:overview} & RTT Estimate \\
T2 & 4s & Section \ref{sec:trans:client:noninv:formal} & The maximum retransmit\\
 & & & interval for non-{\INVITE} \\
 & & & requests and {\INVITE}\\
 & & &  responses \\
T4 & 5s & Section \ref{sec:trans:client:noninv:formal} & Maximum duration a\\
 & & & message will \\
 & & & remain in the network \\
Timer A & initially T1 & Section \ref{sec:transactions:client:invite:formal} & {\INVITE} request retransmit \\
 & & & interval, for UDP only \\
Timer B & 64*T1 & Section \ref{sec:transactions:client:invite:formal} & {\INVITE} transaction\\
 & & & timeout timer \\
Timer C & $>$ 3min & Section Section \ref{sec:proxy-request-processing} & proxy {\INVITE} transaction \\
 & & bullet \ref{sec:proxy-request-processing:timerc} & timeout \\
Timer D & $>$ 32s for UDP & Section \ref{sec:transactions:client:invite:formal} & Wait time for response \\
 & 0s for TCP/SCTP & & retransmits \\
Timer E & initially T1 & Section \ref{sec:trans:client:noninv:formal} & non-{\INVITE} request\\
 & & & retransmit interval,\\
 & & & UDP only \\
Timer F & 64*T1 & Section \ref{sec:trans:client:noninv:formal} & non-{\INVITE} transaction\\
 & & & timeout timer \\
Timer G & initially T1 & Section \ref{sec:transactions:server:invite} & {\INVITE} response\\
 & & & retransmit interval \\
Timer H & 64*T1 & Section \ref{sec:transactions:server:invite} & Wait time for\\
 & & & {\ACK} receipt \\
Timer I & T4 for UDP & Section \ref{sec:transactions:server:invite} & Wait time for\\
 & 0s for TCP/SCTP & & {\ACK} retransmits \\
Timer J & 64*T1 for UDP & Section \ref{sec:transactions:server:noninv} & Wait time for\\
 & 0s for TCP/SCTP & & non-{\INVITE} request \\
 & & & retransmits \\
Timer K & T4 for UDP & Section \ref{sec:trans:client:noninv:formal} & Wait time for\\
 & 0s for TCP/SCTP & & response retransmits \\
\end{tabular}
\end{center}
\caption{Summary of timers}

\label{tab:timers}
\end{table}
