[SR-Users] dispatcher problem

[Carsten Bock]

Hi,

what you are seeing here, are the retransmits for the OPTIONS-Requests.
The Dispatcher checks every 10 seconds for "dead" destinations and
then sends out the OTIONS-Request using TM (which is doing the
retransmits).

This might be a little overlapping, e.g.
- OPTIONS-Request (initial request, 1st try)
- 0,5s (retransmit, 1st try)
- 1s (retransmit, 1st try)
- 2s (retransmit, 1st try) = 3,5 Seconds from initial request
- 4s (retransmit, 1st try) = 7,5 Seconds from initial request
- 10s OPTIONS-Request (initial request, 2nd try)
- 10,5s (retransmit, 2nd try)
- 11,5s (2x, retransmit, 2nd try + retransmit, 1st try)
- 13,5s (retransmit, 2nd try)
- 15,5s (retransmit, 1st try)
(and so on).

That is the reason for this behaviour, and may look confusing....

Carsten

2010/9/10  <klaus.lists at inode.at>:
> Hello Daniel,
>
> these days I'm playing a lot with the dispatcher module and from my point
> of view I found a strange behaviour of the module, which is not according
> the description in the documentation and as you've explained in the list.
>
> I've learned that polling of failed gwys is only supported when the
> parameter "ds_ping_interval" is set to a value above '0' (the default
> value of '10' is no longer supported).
>
> However, when a gateway is in probing state the polling interval is never
> the value that is set in the modparam, it is - in dependent from this
> value - always a 'fix' period. E.g. the OPTIONS message is sent in
> following interval: 0.5-1-2-4-4-4-4 and afterwards it looks a little bit
> chaotic without a specified interval (= random).
>
> Is this as expected or do I miss another modparam that is mandatory? My
> config looks as follows:
> # ----- DISPATCHER -----
> modparam("dispatcher", "db_url",
> "mysql://openser:openserrw@localhost/openser")
> modparam("dispatcher", "table_name", "dispatcher")
> modparam("dispatcher", "dst_avp", "$avp(AVP_DST)")
> modparam("dispatcher", "grp_avp", "$avp(AVP_GRP)")
> modparam("dispatcher", "cnt_avp", "$avp(AVP_CNT)")
> modparam("dispatcher", "ds_ping_from", "sip:proxy at 192.168.37.87")
> modparam("dispatcher", "ds_probing_mode", 0)
> modparam("dispatcher", "ds_ping_interval", 20)
> modparam("dispatcher", "flags", 2)
> modparam("dispatcher", "force_dst", 1)
>
> regards,
>
> Klaus Feichtinger
>
>
>>   Hello,
>>
>> I fixed, thanks for pointing out.
>>
>> We would need a documentation marshall that should update the docs as
>> something related is discussed on the lists. But none really volunteered
>>  to do it. For developers is not always obvious or easy (due to lack of
>> time) to track the doc changes.
>>
>> Anyone stepping forward?
>>
>> Cheers,
>> Daniel
>>
>> On 9/8/10 12:01 PM, klaus.lists at inode.at wrote:
>>> Klaus, Daniel-Constantin,
>>>
>>> I had the same "problem" and found the 'solution' in archived mails
>>> from diverse mailing lists only.
>>>
>>> In general the documentation is not really up-to-date. Because also
>>> the hint in modules documentation, chapter 3.16 "[...] if compiled
>>> with the probing of failed gateways enabled [...]" is no longer valid
>>> (as commented by Daniel-Constantin in another list).
>>>
>>> Please update the documentation for the next major release 3.1 to
>>> avoid any more confusions.
>>>
>>> THX
>>>
>>> regards,
>>> Klaus
>>>
>>>> Am 07.09.2010 20:58, schrieb Daniel-Constantin Mierla:
>>>>> Hello,
>>>>>
>>>>> you have to set the ping interval parameter:
>>>>> http://kamailio.org/docs/modules/stable/modules_k/dispatcher.html#id2590104
>>>>>
>>>>> I see that documentation says its default value is 10, but in
>>>>> sources is 0, which means this feature is disabled.
>>>> That was the reason I didn't configured it.
>>>>
>>>> Thanks
>>>> Klaus
>>>>
>>>>
>>>> _______________________________________________
>>>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing
>>>> list sr-users at lists.sip-router.org
>>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>>
>>>
>>>
>>> _______________________________________________
>>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing
>>> list sr-users at lists.sip-router.org
>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>
>> --
>> Daniel-Constantin Mierla
>> http://www.asipto.com
>
>
>
>
> _______________________________________________
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>



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