[SR-Users] Problem faced when Using Kamaiio as Session Refresher
Daniel-Constantin Mierla
miconda at gmail.com
Mon Mar 23 14:51:25 CET 2020
Hello,
looking at logs, the callback functions from sst modules are for
requests within dialog, not for initial request. It looks like the
update is expected to be done when the request refreshing the session is
done (the reinvite), therefore for initial INVITE the avp is not set.
Mar 23 15:14:39 CPaaSVM kamailio: 1(4248) DEBUG: {1 1 INVITE
1-5214 at 172.27.44.121} sst [sst_handlers.c:988]:
setup_dialog_callbacks(): Adding callback
DLGCB_FAILED|DLGCB_TERMINATED|DLGCB_EXPIRED
Mar 23 15:14:39 CPaaSVM kamailio: 1(4248) DEBUG: {1 1 INVITE
1-5214 at 172.27.44.121} sst [sst_handlers.c:992]:
setup_dialog_callbacks(): Adding callback DLGCB_REQ_WITHIN
Mar 23 15:14:39 CPaaSVM kamailio: 1(4248) DEBUG: {1 1 INVITE
1-5214 at 172.27.44.121} sst [sst_handlers.c:1002]:
setup_dialog_callbacks(): Adding callback DLGCB_RESPONSE_FWDED
Mar 23 15:14:39 CPaaSVM kamailio: 1(4248) DEBUG: {1 1 INVITE
1-5214 at 172.27.44.121} sst [sst_handlers.c:1006]:
setup_dialog_callbacks(): Adding rpc handler
There are callbacks for the response as well, and they seem to be
executed, avp attempted to be set, but already having the same value:
Mar 23 15:14:39 CPaaSVM kamailio: 37(4284) DEBUG: {2 1 INVITE
1-5214 at 172.27.44.121} sst [sst_handlers.c:520]:
sst_dialog_response_fwded_CB(): Dialog seen REPLY 200 OK
Mar 23 15:14:39 CPaaSVM kamailio: 37(4284) DEBUG: {2 1 INVITE
1-5214 at 172.27.44.121} sst [sst_handlers.c:870]: set_timeout_avp():
Current timeout value already set to 200
A solution you can try for now would be to set the avp explicitly for
the first invite, like:
if(is_present_hf(Session-Expires)) {
$avp(...) = $(hdr(Session-Expires){s.int});
}
Cheers,
Daniel
On 23.03.20 11:29, harneet singh wrote:
> Hi Daniel,
>
> I have shared the logs at debug=3 level.
> Location: https://justpaste.it/6xmum
> I do see the sst and dialog module are loaded at startup and Even
> that the sst module sees the Session-Expires value. But somehow the
> dialog module doesn't seem to recognize it.
>
> Please see the excerpts from the log below:
> Mar 23 15:14:39 CPaaSVM kamailio: 1(4248) DEBUG: {1 1
> INVITE 1-5214 at 172.27.44.121 <mailto:1-5214 at 172.27.44.121>} sst
> [sst_handlers.c:668]: ki_sst_check_min(): Session-Expires: 200;
> MIN-SE: 100
> Mar 23 15:14:39 CPaaSVM kamailio: 1(4248) DEBUG: {1 1
> INVITE 1-5214 at 172.27.44.121 <mailto:1-5214 at 172.27.44.121>} sst
> [sst_handlers.c:692]: ki_sst_check_min(): Done returning false (-1)
> ............
> .............
> Mar 23 15:14:39 CPaaSVM kamailio: 1(4248) DEBUG: {1 1
> INVITE 1-5214 at 172.27.44.121 <mailto:1-5214 at 172.27.44.121>} dialog
> [dlg_handlers.c:681]: get_dlg_timeout(): invalid AVP value, using
> default timeout
>
> Can you please take a look?
>
> Regards,
> Harneet
>
> On Mon, Mar 23, 2020 at 3:42 PM harneet singh <hbilling at gmail.com
> <mailto:hbilling at gmail.com>> wrote:
>
> Hi Daniel,
>
> I have attached here the logs at debug=3 level. I do see the sst
> and dialog module are loaded at startup and Even that the sst
> module sees the Session-Expires value. But somehow the dialog
> module doesn't seem to recognize it.
>
> Please see the excerpts from the log below:
> Mar 23 15:14:39 CPaaSVM kamailio: 1(4248) DEBUG: {1 1 INVITE
> 1-5214 at 172.27.44.121 <mailto:1-5214 at 172.27.44.121>} sst
> [sst_handlers.c:668]: ki_sst_check_min(): Session-Expires: 200;
> MIN-SE: 100
> Mar 23 15:14:39 CPaaSVM kamailio: 1(4248) DEBUG: {1 1 INVITE
> 1-5214 at 172.27.44.121 <mailto:1-5214 at 172.27.44.121>} sst
> [sst_handlers.c:692]: ki_sst_check_min(): Done returning false (-1)
> ............
> .............
> Mar 23 15:14:39 CPaaSVM kamailio: 1(4248) DEBUG: {1 1 INVITE
> 1-5214 at 172.27.44.121 <mailto:1-5214 at 172.27.44.121>} dialog
> [dlg_handlers.c:681]: get_dlg_timeout(): invalid AVP value, using
> default timeout
>
> Can you please take a look?
>
> Regards,
> Harneet
>
> On Mon, Mar 23, 2020 at 3:02 PM Daniel-Constantin Mierla
> <miconda at gmail.com <mailto:miconda at gmail.com>> wrote:
>
> Hello,
>
> also check if code from sst module is executing when
> processing the dialog. Maybe the callback functions from sst
> are not called when dialog is handling the sip traffic. You
> should run with debug=3 and look at the debug messages to see
> if there are some printed from sst module. Watch also for
> other error or warning log messages, they may indicate that
> some processing could not be done.
>
> Eventually you can make the debug messages (from kamailio
> start to processing of the dialog) available somewhere online
> (e.g., pastebin) so we can look at them and analyze.
>
> Cheers,
> Daniel
>
> On 22.03.20 15:23, Daniel-Constantin Mierla wrote:
>>
>> Hello,
>>
>> ah, ok, I misunderstood.
>>
>> Is the INVITE received with the header Session-Expires?
>>
>> And remove the line:
>>
>> #!define DLG_TIMEOUT_AVP "i:1"
>>
>> It does not replaces the token inside strings, like inside
>> the last parameter of the line:
>>
>> modparam("dialog", "timeout_avp", "$avp(DLG_TIMEOUT_AVP)")
>>
>> and if you use in config expressions $avp(DLG_TIMEOUT_AVP),
>> then its name is replaced. So overall it can be two avp
>> names, although when reading looks like one.
>>
>> Cheers,
>> Daniel
>>
>> On 22.03.20 14:40, harneet singh wrote:
>>> Hi Daniel,
>>>
>>> Thanks for the confirmation. Your point confirms the same as
>>> I interpreted from the documentation, that Kamailio would
>>> not send refresh INVITEs. I am not expecting to achieve
>>> that. However, if i understand correctly, Kamailio can look
>>> into the "Session-Expires" header from UAC/UAS and set the
>>> timeout_avp based on that.
>>> In effect, Kamailio should ideally *tear down the call (Send
>>> a BYE to UAC and UAS)*, if it doesn't see any signalling(may
>>> it be session-refresh INVITE/UPDATE or any other mid-dialog
>>> messages). This i believe can be done by using the SST
>>> Module in conjunction with the Dialog Module.
>>> I am also using the SST Module and the Dialog Module,
>>> however have the following issues.
>>>
>>> 1. I am seeing the following message when sending
>>> Session-Expires: 200 .
>>> ""dialog [dlg_handlers.c:681]: *get_dlg_timeout():
>>> invalid AVP value, using default timeout*"
>>>
>>> Not sure what is causing this.
>>>
>>> 2. If i try to hardcode the session-expires to a certain
>>> value, the Kamailio DOES send a BYE to UAC and UAS on the
>>> timer expiry if no signaling seen during that time. However,
>>> as pointed earlier, the Dialog Load on the Kamailio DOES NOT
>>> go down, as shown in the last email.
>>>
>>> FWIW, here's the config snippet from the Kamailio cfg i am
>>> using.
>>>
>>> ==========================================================================
>>> #!define *DLG_TIMEOUT*_AVP "i:1"
>>>
>>> # ----------- dialog params -----------
>>> modparam("dialog", "send_bye", 1)
>>> *modparam("dialog", "timeout_avp", "$avp(DLG_TIMEOUT_AVP)")*
>>> modparam("dialog", "dlg_flag", 5)
>>>
>>> # ----------- sst params -----------
>>> modparam("sst", "enable_stats", 1)
>>> modparam("sst", "min_se", 150)
>>> # Set the sst modules timeout_avp to be the same value
>>> *modparam("sst", "timeout_avp", "$avp(DLG_TIMEOUT_AVP)")*
>>> #modparam("sst", "reject_to_small", 1)
>>> modparam("sst", "sst_flag", 6)
>>>
>>>
>>> request_route {
>>> .......
>>> .......
>>> # account only INVITEs
>>> if (is_method("INVITE")) {
>>> setflag(FLT_ACC); # do accounting
>>>
>>> setflag(5); # set the dialog flag
>>> setflag(6); # Set the sst flag
>>> $dlg_ctx(timeout_bye)=1;
>>>
>>> if (sstCheckMin("1")) {
>>> xlog("L_ERR", "422 Session Timer Too
>>> Small reply sent.\n");
>>> exit;
>>> }
>>>
>>> }
>>> .....
>>> ......
>>> }
>>>
>>>
>>> ==========================================================================
>>>
>>> From the SST documentation, it pretty much seems like the
>>> only config to do. Am I missing something. If you have a
>>> working config for the Kamailio tuned in this manner using
>>> the SST and Dialog Module, could you share the same?
>>> Any pointers to make it work are most welcome.
>>>
>>> Regards,
>>> Harneet
>>>
>>>
>>>
>>> On Sun, Mar 22, 2020 at 3:01 PM Daniel-Constantin Mierla
>>> <miconda at gmail.com <mailto:miconda at gmail.com>> wrote:
>>>
>>> Hello,
>>>
>>> are you looking for Kamailio to send re-INVITEs? If yes,
>>> that is not available as a feature of dialog module.
>>>
>>> Cheers,
>>> Daniel
>>>
>>> On 21.03.20 10:39, harneet singh wrote:
>>>> Hi,
>>>>
>>>> I am fairly new to Kamailio and had a question
>>>> regarding how to use Kamailio to enable Session refresh
>>>> functionality when Kamailio is acting as Sip Stateful
>>>> Proxy.
>>>> Kamailio Version used: *5.3.2* with *Call Load based
>>>> routing* using the *dispatcher *module.
>>>>
>>>>
>>>> * From what i understand from the documentation,
>>>> Kamailio will probably not be acting as a session
>>>> refresher, but Kamailio can tear down the call in case
>>>> session refresh is negotiated, between the caller and
>>>> the callee(via Kamailio Sip Proxy), and no message
>>>> exchange happens in the duration set in Session-Expires
>>>> header. *Is my understanding correct?*
>>>> *
>>>> *
>>>> ** *I believe the above functionality is possible by
>>>> using the *sst* and *dialog* module. I have set the
>>>> same according to the documentation but I keep getting
>>>> the following error:
>>>> "dialog [dlg_handlers.c:681]: *get_dlg_timeout():
>>>> invalid AVP value, using default timeout*"
>>>> Can someone share a working example?
>>>>
>>>> * When i tried hardcoding the timeout value by setting
>>>> the timeout_avp to a specific value, Kamailio did sense
>>>> a timeout and hence sent a BYE towards the caller and
>>>> the Callee side both(which is what the requirement is),
>>>> however, i do see the *dialog is still not cleared* in
>>>> the "kamcmd dispatcher.list". Output excerpt below for
>>>> reference:
>>>>
>>>> [root at CPaaSVM ~]# kamcmd dispatcher.list
>>>> {
>>>> NRSETS: 1
>>>> RECORDS: {
>>>> SET: {
>>>> ID: 1
>>>> TARGETS: {
>>>> DEST: {
>>>> URI:
>>>> sip:172.27.44.121:5080;transport=tcp
>>>> FLAGS: AP
>>>> PRIORITY: 0
>>>> ATTRS: {
>>>> BODY:
>>>> duid=sample-cas;maxload=1000
>>>> DUID:
>>>> sample-cas
>>>>
>>>> MAXLOAD: 1000
>>>> WEIGHT: 0
>>>> RWEIGHT: 0
>>>> SOCKET:
>>>> }
>>>> LATENCY: {
>>>> AVG:
>>>> 111.304000
>>>> STD:
>>>> 1042.193000
>>>> EST:
>>>> 2.385000
>>>> MAX: 9999
>>>> TIMEOUT: 1
>>>> }
>>>> RUNTIME: {
>>>>
>>>> DLGLOAD: *1*
>>>> }
>>>> }
>>>> }
>>>> }
>>>> }
>>>> }
>>>>
>>>> It is noteworthy that in case the BYE is initiated by
>>>> either the caller or the callee, the dialog is cleared
>>>> properly and the DLGLOAD is set to 0 on call termination.
>>>>
>>>> Any pointers for the above questions would be highly
>>>> appreciated.
>>>>
>>>> Regards,
>>>> Harneet
>>>>
>>>> --
>>>> "Once you eliminate the impossible, whatever remains,
>>>> no matter how improbable, must be the truth" - Sir
>>>> Arthur Conan Doyle
>>>>
>>>> _______________________________________________
>>>> Kamailio (SER) - Users Mailing List
>>>> sr-users at lists.kamailio.org <mailto:sr-users at lists.kamailio.org>
>>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>>
>>> --
>>> Daniel-Constantin Mierla -- www.asipto.com <http://www.asipto.com>
>>> www.twitter.com/miconda <http://www.twitter.com/miconda> -- www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda>
>>>
>>>
>>>
>>> --
>>> "Once you eliminate the impossible, whatever remains, no
>>> matter how improbable, must be the truth" - Sir Arthur Conan
>>> Doyle
>> --
>> Daniel-Constantin Mierla -- www.asipto.com <http://www.asipto.com>
>> www.twitter.com/miconda <http://www.twitter.com/miconda> -- www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda>
>
> --
> Daniel-Constantin Mierla -- www.asipto.com <http://www.asipto.com>
> www.twitter.com/miconda <http://www.twitter.com/miconda> -- www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda>
>
>
>
> --
> "Once you eliminate the impossible, whatever remains, no matter
> how improbable, must be the truth" - Sir Arthur Conan Doyle
>
>
>
> --
> "Once you eliminate the impossible, whatever remains, no matter how
> improbable, must be the truth" - Sir Arthur Conan Doyle
--
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
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