This object reflects the maximum time a SIP client will wait to
receive retransmissions of responses to non-INVITE requests.
The timer is started upon entering the 'Completed' state for
non-INVITE transactions. When timer K fires, the server MUST
transition to the 'Terminated' state. The default value MUST
be T4 for UDP transport, and its value MUST be 0 for reliable
transport like TCP/SCTP.