Hello Denis,
So far there is no good arguments for such a function, but there are a
lot of performance penalties while using such a function.
Basically, to apply the change to a message, opensips/kamilio has to 1)
take the received buffer and the changes and to generate a new buffer
with the whole message (including the changes) and to 2) take the newly
generate buffer and to parse it as a SIP content in order to be able to
use internally it.
Bottom line, each time you use such a function you double the processing
effort for parsing and generating SIP messages. And if you check the
code profiling we did (see
http://www.opensips.org/Resources/TestsProfiling), these operations are
~50% from the total CPU usage (cumulate the PARSE and BUILD times).
Now, in most of the cases (99% of the case) you do not really need to
apply changes in realtime - there are a lot of simple tricks to avoid
it. If you describe the problem you have, I can help you in putting some
extra logic in the script to avoid the need to apply changes.
Using a smart approach is more efficient than a brute force approach -
the idea is that you are aware of the changes you do in script and you
remember (in script) these changes, so you can take them into account in
your later processing even if they are not actually applied on the SIPS
message.
Regards,
Bogdan
Denis Putyato wrote:
Hello!
In kamailio project there is a function |msg_apply_changes() ||in
textops module for applying changes (for example add or subst some
header field) in SIP messages. Is there some way on opensips for doing
such operation? Now I need make signaling “loop” for change header
fields which I, for example, add during call process.|
| |
|Opensips 1.6.3|
| |
|Thank you || |
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Bogdan-Andrei Iancu
OpenSIPS Event - expo, conf, social, bootcamp
2 - 4 February 2011, ITExpo, Miami, USA
www.voice-system.ro
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