Re: [SR-Users] Kamailio ​ds_ping_interval Performance

[Jurijs Ivolga]

Hi,

Please check how SIP works, but as far as I remember if Kamailio gets 200
from Freeswitch #2, it will send cancell to all other branches.

With kind regards,

Jurijs

On Tue, Apr 10, 2018 at 9:01 AM, Atul Thosar  wrote:

> Any pointers, suggestions.
>
> --
> ​Thanks,
> Atul Thosar
>
>
>
> On 8 April 2018 at 17:23, Atul Thosar  wrote:
>
>> Thanks all for your responses.
>>
>>
>> I am new to Kamailio, so appreciate if some one can help me with sample
>> code where kamailio routes call to another FreeSWITCH server if 1st
>> FreeSWITCH server does not respond in some time, say 3 sec. Btw I have a
>> query on this approach. Consider a following scenario -
>>
>> 0. kamailio is configured w/ 2 FreeSWITCH servers in dispatcher and with
>> configuration where on not receiving response to INVITE in 3 sec, kamailio
>> will forward the call to another FreeSWITCH server.
>> 1. kamailio receives INVITE and forwards INVITE to FreeSWITCH #1
>> 2. FreeSWITCH #1 receives INVITE, but 100 trying response could not reach
>> to kamailio bec of network break, say for 4 sec.
>> 3. So After 3 sec, since kamailio does not receive any response from
>> FreeSWITCH #1, it forwards INVITE to FreeSWITCH #2
>> 4. FreeSWITCH #2 responds with 200 OK and kamailio receives it.
>> 5. After 4 sec, when network recovers, FreeSWITCH #1 sends 200 OK to
>> kamailio. How kamailio would behave here? Will it drops the call w/
>> FreeSWITCH #1?
>>
>>
>> --
>> ​Thanks,
>> Atul Thosar
>>
>>
>>
>> On 7 April 2018 at 21:46, Julien Chavanton  wrote:
>>
>>> Hi,
>>>
>>> I would set it to a low value to make sure you avoid sending calls a
>>> Freeswitch server facing problems, in the case of Freeswitch the same GW
>>> will also handle media, if it is having hardtime repliyng to SIP OPTIONS it
>>> will very likely have problem handling the media.
>>>
>>> It may also get worst during the call even stop responsding and loose
>>> transaction in progress or in dialog transactions later like session timers
>>> and BYEs.
>>>
>>> Off loading it may able help other calls already using it.
>>>
>>>
>>> You may push your strategy further thinking about :
>>>
>>> - The risk is that you run out of GW, could be handled when ds_select is
>>> returning nothing.
>>> - Another side effect, would be that you are sending more traffic to
>>> other GW, they must be able to handle the extra load.
>>>
>>> In kamailio 5 there is a new algorithm that behaves better when one GW
>>> is put out of service.
>>>
>>> “11” - use relative weight based load distribution. You have to set the
>>> attribute 'rweight' per each address in destination set. Active host usage
>>> probability is rweight/(SUM of all active host rweights in destination
>>> group).
>>>
>>> Regards
>>> Julien
>>>
>>> On Mon, Apr 2, 2018 at 6:06 PM, Atul Thosar 
>>> wrote:
>>>
 Hi All,
 I am using Kamailio
 ​*​*
 *v4.4.x* to load balanced traffic to FreeSWITCH servers. I have query
 regarding ds_ping_interval and ds_probing_threshold. We have very high
 traffic (around 200-400
 ​ (CPS)​
 calls per sec) hitting on Kamailio which then distribute it to 2-3
 FreeSWITCH servers.
 ​ ​
 What is the optimal value should I set to ds_ping_interval and
 ds_probing_threshold?

 If I set
 ​​
 ds_ping_interval=2 and
 ​​
 ds_probing_threshold=1 then in every 2 sec, I would come to know if my
 ​​
 FreeSWITCH server is down/up. But by setting such low values, I afraid
 there would
 ​be ​
 lot of SIP traffic on network.
 ​ If I set high (say
 ​
 ds_probing_threshold=5) then I may loose high number of calls (200 CPS,
 I will loose 1000 calls) in case
 ​
 FreeSWITCH server is down. ​


 As I said earlier we have very high traffic hitting on Kamailio, can't
 kamailio use INVITE itself to probe FreeSWITCH server is down/up? In case
 of low traffic can't it switch over to OPTION mechanism?

 --
 ​Thanks in Advance​
 ,
 ​​
 Atul
 ​​
 ​​
 ​​



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>>>
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>>
>
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Re: [SR-Users] Kamailio ​ds_ping_interval Performance

[Atul Thosar]

Thanks all for your responses.


I am new to Kamailio, so appreciate if some one can help me with sample
code where kamailio routes call to another FreeSWITCH server if 1st
FreeSWITCH server does not respond in some time, say 3 sec. Btw I have a
query on this approach. Consider a following scenario -

0. kamailio is configured w/ 2 FreeSWITCH servers in dispatcher and with
configuration where on not receiving response to INVITE in 3 sec, kamailio
will forward the call to another FreeSWITCH server.
1. kamailio receives INVITE and forwards INVITE to FreeSWITCH #1
2. FreeSWITCH #1 receives INVITE, but 100 trying response could not reach
to kamailio bec of network break, say for 4 sec.
3. So After 3 sec, since kamailio does not receive any response from
FreeSWITCH #1, it forwards INVITE to FreeSWITCH #2
4. FreeSWITCH #2 responds with 200 OK and kamailio receives it.
5. After 4 sec, when network recovers, FreeSWITCH #1 sends 200 OK to
kamailio. How kamailio would behave here? Will it drops the call w/
FreeSWITCH #1?


--
​Thanks,
Atul Thosar



On 7 April 2018 at 21:46, Julien Chavanton  wrote:

> Hi,
>
> I would set it to a low value to make sure you avoid sending calls a
> Freeswitch server facing problems, in the case of Freeswitch the same GW
> will also handle media, if it is having hardtime repliyng to SIP OPTIONS it
> will very likely have problem handling the media.
>
> It may also get worst during the call even stop responsding and loose
> transaction in progress or in dialog transactions later like session timers
> and BYEs.
>
> Off loading it may able help other calls already using it.
>
>
> You may push your strategy further thinking about :
>
> - The risk is that you run out of GW, could be handled when ds_select is
> returning nothing.
> - Another side effect, would be that you are sending more traffic to other
> GW, they must be able to handle the extra load.
>
> In kamailio 5 there is a new algorithm that behaves better when one GW is
> put out of service.
>
> “11” - use relative weight based load distribution. You have to set the
> attribute 'rweight' per each address in destination set. Active host usage
> probability is rweight/(SUM of all active host rweights in destination
> group).
>
> Regards
> Julien
>
> On Mon, Apr 2, 2018 at 6:06 PM, Atul Thosar  wrote:
>
>> Hi All,
>> I am using Kamailio
>> ​*​*
>> *v4.4.x* to load balanced traffic to FreeSWITCH servers. I have query
>> regarding ds_ping_interval and ds_probing_threshold. We have very high
>> traffic (around 200-400
>> ​ (CPS)​
>> calls per sec) hitting on Kamailio which then distribute it to 2-3
>> FreeSWITCH servers.
>> ​ ​
>> What is the optimal value should I set to ds_ping_interval and
>> ds_probing_threshold?
>>
>> If I set
>> ​​
>> ds_ping_interval=2 and
>> ​​
>> ds_probing_threshold=1 then in every 2 sec, I would come to know if my
>> ​​
>> FreeSWITCH server is down/up. But by setting such low values, I afraid
>> there would
>> ​be ​
>> lot of SIP traffic on network.
>> ​ If I set high (say
>> ​
>> ds_probing_threshold=5) then I may loose high number of calls (200 CPS, I
>> will loose 1000 calls) in case
>> ​
>> FreeSWITCH server is down. ​
>>
>>
>> As I said earlier we have very high traffic hitting on Kamailio, can't
>> kamailio use INVITE itself to probe FreeSWITCH server is down/up? In case
>> of low traffic can't it switch over to OPTION mechanism?
>>
>> --
>> ​Thanks in Advance​
>> ,
>> ​​
>> Atul
>> ​​
>> ​​
>> ​​
>>
>>
>>
>> ___
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>> sr-users@lists.kamailio.org
>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>
>>
>
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Re: [SR-Users] Kamailio ​ds_ping_interval Performance

[Julien Chavanton]

Hi,

I would set it to a low value to make sure you avoid sending calls a
Freeswitch server facing problems, in the case of Freeswitch the same GW
will also handle media, if it is having hardtime repliyng to SIP OPTIONS it
will very likely have problem handling the media.

It may also get worst during the call even stop responsding and loose
transaction in progress or in dialog transactions later like session timers
and BYEs.

Off loading it may able help other calls already using it.


You may push your strategy further thinking about :

- The risk is that you run out of GW, could be handled when ds_select is
returning nothing.
- Another side effect, would be that you are sending more traffic to other
GW, they must be able to handle the extra load.

In kamailio 5 there is a new algorithm that behaves better when one GW is
put out of service.

“11” - use relative weight based load distribution. You have to set the
attribute 'rweight' per each address in destination set. Active host usage
probability is rweight/(SUM of all active host rweights in destination
group).

Regards
Julien

On Mon, Apr 2, 2018 at 6:06 PM, Atul Thosar  wrote:

> Hi All,
> I am using Kamailio
> ​*​*
> *v4.4.x* to load balanced traffic to FreeSWITCH servers. I have query
> regarding ds_ping_interval and ds_probing_threshold. We have very high
> traffic (around 200-400
> ​ (CPS)​
> calls per sec) hitting on Kamailio which then distribute it to 2-3
> FreeSWITCH servers.
> ​ ​
> What is the optimal value should I set to ds_ping_interval and
> ds_probing_threshold?
>
> If I set
> ​​
> ds_ping_interval=2 and
> ​​
> ds_probing_threshold=1 then in every 2 sec, I would come to know if my
> ​​
> FreeSWITCH server is down/up. But by setting such low values, I afraid
> there would
> ​be ​
> lot of SIP traffic on network.
> ​ If I set high (say
> ​
> ds_probing_threshold=5) then I may loose high number of calls (200 CPS, I
> will loose 1000 calls) in case
> ​
> FreeSWITCH server is down. ​
>
>
> As I said earlier we have very high traffic hitting on Kamailio, can't
> kamailio use INVITE itself to probe FreeSWITCH server is down/up? In case
> of low traffic can't it switch over to OPTION mechanism?
>
> --
> ​Thanks in Advance​
> ,
> ​​
> Atul
> ​​
> ​​
> ​​
>
>
>
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> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>
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Re: [SR-Users] Kamailio ​ds_ping_interval Performance

[Daniel-Constantin Mierla]

Hello,

On 03.04.18 03:06, Atul Thosar wrote:
> Hi All,
> I am using Kamailio
> ​*​*
> *v4.4.x* to load balanced traffic to FreeSWITCH servers. I have query
> regarding ds_ping_interval and ds_probing_threshold. We have very high
> traffic (around 200-400
> ​ (CPS)​
> calls per sec) hitting on Kamailio which then distribute it to 2-3
> FreeSWITCH servers.
> ​ ​
> What is the optimal value should I set to ds_ping_interval and
> ds_probing_threshold?
>
> If I set  
> ​​
> ds_ping_interval=2 and
> ​​
> ds_probing_threshold=1 then in every 2 sec, I would come to know if my
> ​​
> FreeSWITCH server is down/up. But by setting such low values, I afraid
> there would
> ​be ​
> lot of SIP traffic on network.
> ​ If I set high (say
> ​
> ds_probing_threshold=5) then I may loose high number of calls (200
> CPS, I will loose 1000 calls) in case 
> ​
> FreeSWITCH server is down. ​
>
>
> As I said earlier we have very high traffic hitting on Kamailio, can't
> kamailio use INVITE itself to probe FreeSWITCH server is down/up? In
> case of low traffic can't it switch over to OPTION mechanism?
>
no matter how low you set the keepalive ping interval, it is still
recommended to do failure routing in case a call sent to a freeswitch is
not accepted the call.

Given the above, usually my approach is to have ds_ping_interval not
that low, but like 20 to 40 seconds, and do always re-routing if a call
is not accepted by a freeswitch in rather short time (say 2-4 seconds if
freeswitch is in the same network). In this case, no call is lost even a
freeswitch is down.

The keepalive is more for monitoring and seeing that a gateway is down
for long time and do not try it in such case -- you can use event_route
blocks from dispatcher to trigger some alerts if a gateway is down/up.

How to do re-routing in case of failure is shown by the kamailio.cfg
example from dispatcher documentation, with a failure_route block.

Cheers,
Daniel

-- 
Daniel-Constantin Mierla
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio Advanced Training - April 16-18, 2018, Berlin - www.asipto.com
Kamailio World Conference - May 14-16, 2018 - www.kamailioworld.com

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Re: [SR-Users] Kamailio ​ds_ping_interval Performance

[Alex Balashov]

2-3 gateways? You're worrying about nothing. Just set it to as low an interval 
as you like. 

-- Alex

--
Sent via mobile, please forgive typos and brevity. 

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Re: [SR-Users] Kamailio ​ds_ping_interval Performance

[Sergiu Pojoga]

Hi Atul,

What is your main concern? I don't see how a lightweight Options request
and reply every second or so for each of your 2-3 gateways can overwhelm a
network (presumably LAN), considering that you are handling 400 heavyweight
Invites per second.

Cheers.

On Mon, Apr 2, 2018, 9:07 PM Atul Thosar,  wrote:

> Hi All,
> I am using Kamailio
> ​*​*
> *v4.4.x* to load balanced traffic to FreeSWITCH servers. I have query
> regarding ds_ping_interval and ds_probing_threshold. We have very high
> traffic (around 200-400
> ​ (CPS)​
> calls per sec) hitting on Kamailio which then distribute it to 2-3
> FreeSWITCH servers.
> ​ ​
> What is the optimal value should I set to ds_ping_interval and
> ds_probing_threshold?
>
> If I set
> ​​
> ds_ping_interval=2 and
> ​​
> ds_probing_threshold=1 then in every 2 sec, I would come to know if my
> ​​
> FreeSWITCH server is down/up. But by setting such low values, I afraid
> there would
> ​be ​
> lot of SIP traffic on network.
> ​ If I set high (say
> ​
> ds_probing_threshold=5) then I may loose high number of calls (200 CPS, I
> will loose 1000 calls) in case
> ​
> FreeSWITCH server is down. ​
>
>
> As I said earlier we have very high traffic hitting on Kamailio, can't
> kamailio use INVITE itself to probe FreeSWITCH server is down/up? In case
> of low traffic can't it switch over to OPTION mechanism?
>
> --
> ​Thanks in Advance​
> ,
> ​​
> Atul
> ​​
> ​​
> ​​
>
>
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[SR-Users] Kamailio ​ds_ping_interval Performance

[Atul Thosar]

Hi All,
I am using Kamailio
​*​*
*v4.4.x* to load balanced traffic to FreeSWITCH servers. I have query
regarding ds_ping_interval and ds_probing_threshold. We have very high
traffic (around 200-400
​ (CPS)​
calls per sec) hitting on Kamailio which then distribute it to 2-3
FreeSWITCH servers.
​ ​
What is the optimal value should I set to ds_ping_interval and
ds_probing_threshold?

If I set
​​
ds_ping_interval=2 and
​​
ds_probing_threshold=1 then in every 2 sec, I would come to know if my
​​
FreeSWITCH server is down/up. But by setting such low values, I afraid
there would
​be ​
lot of SIP traffic on network.
​ If I set high (say
​
ds_probing_threshold=5) then I may loose high number of calls (200 CPS, I
will loose 1000 calls) in case
​
FreeSWITCH server is down. ​


As I said earlier we have very high traffic hitting on Kamailio, can't
kamailio use INVITE itself to probe FreeSWITCH server is down/up? In case
of low traffic can't it switch over to OPTION mechanism?

--
​Thanks in Advance​
,
​​
Atul
​​
​​
​​
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