[SR-Users] Increase MAX_BRANCHES_LIMIT

[Daniel-Constantin Mierla]

Hello,

the value 32 forMAX_BRANCHES_LIMIT is a constraint of tm internals which
uses a 32 bitmap for some operations, going higher will require coding
in tm module.

The variant now is to loop one more through kamailio and you can get to
32x32 branches. By doing record route only on one step of looping, then
you have this looping only for initial INVITE transaction, the
re-INVITE, BYE, etc. will go straight.

One more note, I am not sure and no time to check the code, one bit
might be reserved in the bitmap, so it can be 31x31 branches after one
local loop.

Cheers,
Daniel

On 10.12.22 13:02, Lars Jansson wrote:
>
> Hi,
>
> I am building a configuration script where for some traffic flows
> parallel forking will be needed, and in this case I need to go beyond
> the default max limit of the max amount of branches.
>
> Apart from this specific case the traffic load that kamailio will need
> to handle is very low, let's say just one second here and there with
> up to 5 concurrent calls at most.
>
> This limit is as far as I understand set here:
> usr/local/src/kamailio-5.6/kamailio/src/core/config.h
>
> And the default limit is:
> #define MAX_BRANCHES_LIMIT              32      /*!< limit of maximum
> number of branches per transaction */
>
> Here are the questions I have related to this:
>
> 1) If I increase the value of this constant in config.h, how high is
> it reasonable to set this value and still have a stable system?
>
> 2) If I increase MAX_BRANCHES_LIMIT beyond 32, are there also other
> parameters that needs to be changed for the system to be able to cope,
> and if so whichparameters?
>
> Regards,
> Lars
>
>
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-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
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