[OpenSER-Users] [OpenSER-Devel] NEW FEATURE: dialog profiling

[Bogdan-Andrei Iancu]

Hi Ovidiu,

why don't you add the dialog to the profile when you receive the 200 OK 
in reply route ?

Regards,
Bogdan

Ovidiu Sas wrote:
> Hello Bogdan,
>
> I started to play with the new profiling feature and tested a few scenarios.
>
> Scenario 1:
> UserA calls UserB.  UserB has call forward no answer configured and activated.
> For the first call (UserA to UserB) I tag the call with profile [caller, UserA].
> When the call is forwarded from UserB to UserC, I re-tag the call with
> profile [caller, UserB].
> Inspecting the profile counters via the MI interface I can see that
> both subprofiles are incremented with 1.
> This works fine for this scenario.
>
> Scenario 2:
> UserA makes a call to PSTN.  I have two gateways configured for
> outgoing calls to PSTN.
> First, the call is routed to GW1 and therefore I tag the the call with
> profile [outgoing, GW1].
> Let's suppose that GW1 is unreachable or to busy to handle new
> requests, and therefore I will failover the call to GW2.
> In this case, I will re-tag the call with profile [outgoing, GW2].
> For this scenario, I would like to keep in the profile "outgoing" the
> the number of active calls to each gateway.
> I think we need a new function that will give the ability to reset a
> previous profile for the existing dialog.
> Before re-routing the call to the second gateway, I would like to have
> the ability to reset the previous profile set for the previous gateway
> so I can have accurate numbers of calls per gateway.
>
>
> Regards,
> Ovidiu Sas
>
> On Mon, Jun 2, 2008 at 11:07 AM, Bogdan-Andrei Iancu
> <bogdan at voice-system.ro> wrote:
>   
>> Hi,
>>
>> I just committed in SVN trunk (1.4, next major release) support for
>> dialog profiling.
>>
>>
>> What dialog profiling is
>> =========================
>>
>> Dialog profiling is a mechanism that helps in classifying, sorting and
>> keeping trace of certain types of dialogs, using whatever properties of
>> the dialog (like caller, destination, type of calls, etc). Dialogs can
>> be dynamically added in different (and several) profile tables -
>> logically, each profile table can have a special meaning (like dialogs
>> outside the domain, dialogs terminated to PSTN, etc).
>> Information provided by the profiles can be used also for doing real
>> load-balancing - by real, I mean routing decisions based on load. So far
>> dispatcher module can do probabilistic dispatching with no feedback on
>> the actual load of the peer (or about the call success). See example 3 -
>> load balancing between 2 asterisk boxes with identical capacities.
>>
>> Being able to actually trace the ongoing dialog, gives liberty to do
>> more complex routing logics.
>>
>>
>> There are two types of profiles:
>>     * with no value - a dialog simply belongs to a profile. (like
>>       outbound calls profile). There is no other additional
>>       information to describe the dialog's belonging to the
>>       profile;
>>     * with value - a dialog belongs to a profile having a certain
>>       value (like in caller profile, where the value is the
>>       caller ID). The belonging of the dialog to the profile is
>>       strictly related to the value.
>>
>> A dialog can be added to multiple profiles in the same time.
>>
>>
>>
>> What it should be used for
>> ===========================
>>
>> Example 1:
>>
>> Count the calls terminating to PSTN in order to monitor the load. Before
>> routing the call the GW, check if the number of ongoing calls (to the
>> GW) do not exceed some value.
>>
>>
>> modparam("dialog","profiles_no_value","pstn_calls")
>> ....
>> /* do some checking */
>> get_dialog_size("pstn_calls","$avp(cnt)");
>> if ( $avp(cnt) > 32 ) {
>>    sl_send_reply("500","GW full");
>>    exit;
>> }
>> set_dlg_profile("pstn_calls");
>> /* route to the GW */
>> .....
>>
>>
>>
>> Example 2:
>>
>> Allow only 2 parallel calls per user - use a profile with value to count
>> the outgoing calls for each subscriber
>>
>> modparam("dialog","profiles_with_value","caller")
>> ....
>> /* do some checking */
>> get_dialog_size("caller","$fu","$avp(cnt)");
>> if ( $avp(cnt) > 2 ) {
>>    sl_send_reply("403","Not allowed");
>>    exit;
>> }
>> set_dlg_profile("caller","$fu");
>> /* route the call */
>> .....
>>
>>
>>
>> Example 3:
>>
>> Do load balancing between 2 asterisk boxes with identical capacities -
>> use a profile with values to count the ongoing calls through each
>> Asterisk box.
>>
>> modparam("dialog","profiles_with_value","asterisk")
>> ....
>> /* do some checking */
>> get_dialog_size("asterisk","box1","$avp(cnt1)");
>> get_dialog_size("asterisk","box2","$avp(cnt2)");
>>
>> if ( $avp(cnt1) > $avp(cnt2) ) {
>>    setdsturi("sip:IP_BOX2:PORT_BOX2");
>>    set_dlg_profile("asterisk","box2");
>> } else {
>>    setdsturi("sip:IP_BOX1:PORT_BOX1");
>>    set_dlg_profile("asterisk","box1");
>> }
>> /* route the call */
>> .....
>>
>> Of course, this can be extended for asymmetric load or for multiple boxes.
>>
>>
>>
>>
>>
>> Regards,
>> Bogdan
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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>>
>>     
>
>