Thanks, JR! That’s something to look at. 

However, in this case probing is disabled. 

—
Sent from mobile, with due apologies for brevity and errors.

> On Aug 13, 2019, at 9:40 AM, JR Richardson <jmr.richard...@gmail.com> wrote:
> 
> Hey Alex,
> 
> After I recently upgraded, I had to include more response codes, 5.2 by 
> default only 200 OK is accepted. I had some upstream carriers sending 405 and 
> were taken off-line as a result until I added that code in modparm:
> 
> modparam("dispatcher", "ds_ping_reply_codes", "class=2;code=405")
> 
> Not sure if this applies to what you are doing, but my dispatcher round robin 
> distribution acts as it did prior to upgrade to 5.2, pretty even, no 
> anomalies with any nodes getting more calls than any other.
> 
> JR
> 
> JR Richardson
> Engineering for the Masses
> Chasing the Azeotrope
> 
> 
> Hi,
> 
> I've got a proxy that does very basic round-robin distribution of calls to an 
> elastic pool of servers, defined in a simple SQLite database with equal 
> priorities. Nothing too complicated, just a vanilla `ds_select_domain("1", 
> "4")`. 
> 
> The only complication is that seldom are most of the gateways enabled.
> Probing stuff was turned on, but didn't do quite what was desired, so it was 
> replaced with a system that manages activation and deactivation of the 
> gateways externally. Nevertheless, these are the left-over probing
> settings:
> 
>   modparam("dispatcher", "ds_ping_method", "OPTIONS")
>   modparam("dispatcher", "ds_ping_from", "sip:pinger@domain")
>   modparam("dispatcher", "ds_ping_interval", 15)
>   modparam("dispatcher", "ds_probing_threshold", 256)
>   modparam("dispatcher", "ds_inactive_threshold", 1)
>   modparam("dispatcher", "ds_probing_mode", 0)
> 
> After an upgrade from 5.1 to 5.2.3 (009f62), the round-robin has become 
> extremely "sticky" and tendentious. That is to say, it directs _almost_ all 
> calls to a single gateway -- the first gateway in the table -- though not 
> 100%. There is also a marked tendency to send lots of consecutive calls to 
> the same gateway, even if it's not the first one, though most of the time it 
> is.
> 
> Has anyone experienced similar upon upgrading to 5.2? 
> 
> Thanks much!
> 
> -- Alex
> 
> 
> 
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