30 May
2024
30 May
'24
2:04 p.m.
Hello Benoit,
You can use $T_inv(...) to access attributes of the original INVITE transaction, to which
the CANCEL pertains:
https://www.kamailio.org/wikidocs/cookbooks/5.8.x/pseudovariables/#t_invpv
However, you may instead consider the attractive simplicity of just calling
rtpengine_delete() for every CANCEL, regardless of whether RTPEngine was engaged. If the
<Call-ID, From-tag> tuple is not recognised by RTPEngine, no harm, no foul -- not an
even error. Yes, there is the overhead of a synchronous round trip to RTPEngine involved
in this. However, in most cases, the consequences aren't too significant.
As someone who has built many overcomplicated Rube Goldberg machines and systems with a
lot of this kind of conditional logic, I've come to appreciate, over the years, the
appeal of a simpler mechanism with fewer moving parts, even at the cost of some
inefficiency.
-- Alex
On May 30, 2024, at 12:12 PM, Benoit Panizzon via
sr-users <sr-users(a)lists.kamailio.org> wrote:
Hi
To determine, if rtpengine was engaged during an invite or not, I make
use of rr params for all messages in following transactions and I set
an avp for all messages in the current transaction.
When the call is canceled, I would need to call rtpengine_delete to
make sure rtpengine stops listening for rtp packets.
Unfortunately, the avp I set during the INVITE, does not seem to be
present while the CANCEL message is processed, despite to my
understanding being in the same transaction.
How can I pass some information from an INVITE to the corresponding
CANCEL?
Mit freundlichen Grüssen
-Benoît Panizzon-
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