This interface represents the RAck header, as defined by
RFC3262, this
header is not part of RFC3261.
The PRACK messages contain an RAck header field, which indicates the
sequence number of the provisional response that is being acknowledged (each
provisional response is given a sequence number, carried in the RSeq header
field in the Provisional response). The acknowledgements are not cumulative,
and the specifications recommend a single outstanding provisional response at
a time, for purposes of congestion control.
The RAck header contains two numbers and a method tag. The first number is
the sequence number from the RSeqHeader in the provisional response that is
being acknowledged. The next number is the sequence number that is copied
from the CSeqHeader along with the method tag, from the response that is being
acknowledged.
For Example:
RAck: 776656 1 INVITE
A server must ignore Headers that it does not understand. A proxy must not
remove or modify Headers that it does not understand.
author: BEA Systems, NIST version: 1.2 |