10 Apr
2015
10 Apr
'15
7:16 a.m.
Hello,
Throughout the routes of kamailio we use multiple variables. These
consist of $var, $avp, $dlg_var and probably more. What's the policy for
these variables when used. When, if even, are they being cleaned up
after a call has been terminated.
Is this something we need to be doing ourselves with functions like
avp_delete("foo")?
Many thanks!
Dirk
10 Apr
10 Apr
8:21 a.m.
On Friday 10 April 2015 13:16:40 Dirk Teurlings - SIGNET B.V. wrote:
Throughout the routes of kamailio we use multiple
variables. These
consist of $var, $avp, $dlg_var and probably more. What's the policy for
these variables when used. When, if even, are they being cleaned up
after a call has been terminated.
These variables are limited to their scope, a $var is valid in the current SIP
message. An $avp's scope is a SIP transaction (eg from INVITE til the end of a
BYE), the same for $dlg_var but then only when using the dialog module.
Destroying seems to be handled internally by kamailio core at the end of a
message, by (I guess) tm.so for $avp and dialog.so for dlg_var at the end of
the transactions lifetime. You don't need to do manual garbage collection,
avp_delete can be used to unset avps within scope though.
8:45 a.m.
On 10 Apr 2015, at 14:21, Daniel Tryba <d.tryba(a)pocos.nl> wrote:
On Friday 10 April 2015 13:16:40 Dirk Teurlings -
SIGNET B.V. wrote:
No, a transaction is a request and the attached responses. From an INVITE to
the
final response or a BYE to the final
response to the BYE - it's not in between INVITE and BYE.
Throughout the routes of kamailio we use multiple
variables. These
consist of $var, $avp, $dlg_var and probably more. What's the policy for
these variables when used. When, if even, are they being cleaned up
after a call has been terminated.
These variables are limited to their scope, a $var is valid in the current SIP
message. An $avp's scope is a SIP transaction (eg from INVITE til the end of a
BYE), the same for $dlg_var but then only when using the
dialog module.
THis applies to the call.
/O
9:30 a.m.
On Friday 10 April 2015 14:45:17 Olle E. Johansson wrote:
Subtle difference, dlg_vars now make sense to me.
Thanks for correcting my views.
These
variables are limited to their scope, a $var is valid in the current
SIP message. An $avp's scope is a SIP transaction (eg from INVITE til
the end of a BYE),
No, a transaction is a request and the attached responses. From an INVITE to
the final response or a BYE to the final
response to the BYE - it's not in between INVITE and BYE. 
8:46 a.m.
On 10/04/15 14:21, Daniel Tryba wrote:
On Friday 10 April 2015 13:16:40 Dirk Teurlings -
SIGNET B.V. wrote:
Some corrections to the above:
- $var(...) is persistent in the context of the process, independent of
the sip message processed at that moment
- $avp(...) (and $xavp(...) for that matter) - is persistent in the
context of the sip transaction, from the request to the final response
of that request. For example, from INVITE to 200ok of the INVITE
- $dlg_var(...) - is persistent in the context of the dialog (or call) -
from the INVITE to the BYE
Throughout the routes of kamailio we use multiple
variables. These
consist of $var, $avp, $dlg_var and probably more. What's the policy for
these variables when used. When, if even, are they being cleaned up
after a call has been terminated.
These variables are limited to their scope, a
$var is valid in the current SIP
message. An $avp's scope is a SIP transaction (eg from INVITE til the end of a
BYE), the same for $dlg_var but then only when using the dialog module.
Destroying seems to be handled internally by kamailio core at the end of a
message, by (I guess) tm.so for $avp and dialog.so for dlg_var at the end of
the transactions lifetime. You don't need to do manual garbage collection,
avp_delete can be used to unset avps within scope though.
$var(...) at not destroyed at runtime, but avp, xavp and dlg_var are
destroyed when their context is destroyed.
Cheers,
Daniel
--
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio World Conference, May 27-29, 2015
Berlin, Germany - http://www.kamailioworld.com
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4 comments
4 participants
participants (4)
-
Daniel Tryba -
Daniel-Constantin Mierla -
Dirk Teurlings - SIGNET B.V. -
Olle E. Johansson