[OpenSER-Devel] NEW FEATURE: dialog profiling

[Ovidiu Sas]

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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