7 Aug
2017
7 Aug
'17
3:06 a.m.
Hello,
t_precheck_trans() is returning true if a SIP worker process has
received the SIP request and it is handling it at that moment. However,
in case of a retransmission, that can be at the moment when the
transaction was already created for the previous same requests (e.g.,
via t_newtran() or the execution is in a branch_route block). The specs
require that a stateful proxy re-sends the last response in case of a
re-transmission. t_check_trans() is used for that purpose, to see if the
transaction was already created and to what specs require.
If still not clear, I will try to add more details.
Cheers,
Daniel
On 04.08.17 21:45, Joe Baran wrote:
Probably an elementary question, but we're
relatively new at digging
into the details. We are trying to understand the following block of
config code and have a question or two. Our assumption is the
t_precheck_trans() function tells us whether another packet has
arrived already as a retransmission. However, we're not clear on what
the t_check_trans() is doing assuming the condition is true. Any
direction on this?
Thanks.
route[CHECK_RETRANS]
{
# handle retransmissions
if(t_precheck_trans()) {
t_check_trans();
exit;
}
}
Joe Baran
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