[SR-Users] How to extract SIP-I ISUP parameters

Mon Apr 2 08:53:47 CEST 2018


On 30.03.18 13:49, Eugene Prokopiev wrote:
> Tried to do the same and even less with KEMI/Lua:
>
> $ cat kamailio/config/kamailio.lua
>
> function ksr_request_route()
>     KSR.info("Lua route\n")
>     if (KSR.textops.has_body("application/isup")) {
>         KSR.info("ISUP body exists\n")
>     }
>     local opv = ""
>     KSR.textops.get_body_part("application/isup", opv)
The second parameter above must be a string with the name of a kamailio
variable, not a Lua variable, like "$var(x)".

Cheers,
Daniel

>     KSR.info("ISUP body content : "..opv.."\n")
>     KSR.sl.send_reply(503, "Server not configured")
> end
>
> I see only endless loop as result:
>
> ...
> kamailio_1  | 12(18) ERROR: <core> [core/io_wait.h:1040]:
> io_wait_loop_epoll(): epoll_wait(16, 0x7f82df873580, 0, 5000): Invalid
> argument [22]
> kamailio_1  | 12(18) ERROR: <core> [core/io_wait.h:1040]:
> io_wait_loop_epoll(): epoll_wait(16, 0x7f82df873580, 0, 5000): Invalid
> argument [22]
> kamailio_1  | 12(18) ERROR: <core> [core/io_wait.h:1040]:
> io_wait_loop_epoll(): epoll_wait(16, 0x7f82df873580, 0, 5000): Invalid
> argument [22]
> ...
>
> Result is not good without 'if (KSR.textops.has_body(...' too:
>
> kamailio_1  |  1(7) INFO: <core> [core/kemi.c:91]:
> sr_kemi_core_info(): Lua route
> kamailio_1  |  1(7) ERROR: <core> [core/pvapi.c:416]: pv_cache_get():
> invalid parameters
> kamailio_1  |  1(7) ERROR: textops [textops.c:2560]:
> ki_get_body_part(): failed to get pv spec
> kamailio_1  |  1(7) INFO: <core> [core/kemi.c:91]:
> sr_kemi_core_info(): ISUP body content :
>
> What is wrong in my code?
>
>
> 2018-03-29 21:53 GMT+03:00 Eugene Prokopiev <enp at itx.ru>:
>> Tried to use get_body_part and isup_to_json first, but looks like I
>> can't understand syntax. My config:
>>
>> loadmodule "tm.so"
>> loadmodule "sl.so"
>> loadmodule "xlog.so"
>> loadmodule "textops.so"
>> loadmodule "ss7ops.so"
>>
>> listen=udp:0.0.0.0:5060
>>
>> route {
>>   get_body_part("application/isup", "$var(pbody)");
>>   isup_to_json(8);
>>   xlog("$isup(1)\n");
>>   sl_send_reply("503", "Server is not configured");
>> }
>>
>> Can't even run it due to:
>>
>> kamailio_1  |  0(1) ERROR: textops [textops.c:2615]:
>> fixup_get_body_part(): failed to fixup result pvar
>> kamailio_1  |  0(1) ERROR: <core> [core/route.c:1154]: fix_actions():
>> fixing failed (code=-1) at cfg:/etc/kamailio/kamailio.cfg:10
>> kamailio_1  | error -1 while trying to fix configuration
>>
>> Can you show me working example with get_body_part and isup_to_json
>> and json dump to stdout?
>>
>> 2018-03-29 18:21 GMT+03:00 Daniel-Constantin Mierla <miconda at gmail.com>:
>>> As I got it, there is an ISUP parser inside ss7ops module.
>>>
>>> It may require a bit of C coding to build a function for helping with
>>> what you need -- the two functions that are useful for doing it are:
>>>
>>>   *
>>> https://www.kamailio.org/docs/modules/stable/modules/textops.html#textops.f.get_body_part
>>>   *
>>> https://www.kamailio.org/docs/modules/stable/modules/ss7ops.html#ss7ops.f.isup_to_json
>>>
>>> The first one shows how to extract the part of the body from the sip
>>> message with the ISUP, the second one shows to convert the ISUP data to
>>> json. From there you can use jansson module to extract fields.
>>>
>>> If you are not familiar with C coding, open a feature request on
>>> kamailio issue tracker on github.com, maybe someone can get to it soon,
>>> otherwise I will look at it when I get a chance.
>>>
>>> The other option right now is to use some Python or Lua script to do the
>>> parsing of ISUP there, maybe there are libraries for it in those
>>> languages. You get get the body of the SIP message inside these messages
>>> using $rb variable or the textops function via KSR KEMI module:
>>>
>>>   -
>>> http://kamailio.org/docs/tutorials/devel/kamailio-kemi-framework/kemimods/#ksrpvget
>>>   -
>>> http://kamailio.org/docs/tutorials/devel/kamailio-kemi-framework/modules/#ksrtextopsget_body_part
>>>
>>> Cheers,
>>> Daniel
>>>
>>> On 29.03.18 12:50, Eugene Prokopiev wrote:
>>>> I can attach screenshot of ISUP part of pcap.
>>>>
>>>> Is it possible to extract all ISUP parameters or at least 'Redirecting
>>>> number' or 'Called IN number'? Can extract ISUP part as is in binary
>>>> form and read by some external script? Are you know about any library
>>>> to parse ISUP binary data?
>>>>
>>>> 2018-03-29 11:30 GMT+03:00 Daniel-Constantin Mierla <miconda at gmail.com>:
>>>>> Hello,
>>>>>
>>>>> can you provide a pcap (or ngrep output) with such invite in order to
>>>>> see what can be done with existing modules? Maybe it needs just some
>>>>> script operations.
>>>>>
>>>>> Cheers,
>>>>> Daniel
>>>>>
>>>>>
>>>>> On 28.03.18 17:26, Eugene Prokopiev wrote:
>>>>>> Hi,
>>>>>>
>>>>>> I need to extract ISUP parameter 'Redirecting number' from SIP-I
>>>>>> INVITE request and add it as SIP header with 'X-' prefix to process in
>>>>>> FreeSWITCH. I tried to read
>>>>>> https://kamailio.org/docs/modules/5.1.x/modules/sipt.html (but it is
>>>>>> about updating headers) and
>>>>>> https://kamailio.org/docs/modules/5.1.x/modules/ss7ops.html (but I
>>>>>> have only ISUP encapsulated in SIP), so not found any solution. Help
>>>>>> me to find it please.
>>>>>>
>>>>> --
>>>>> 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
>>>>>
>>>>
>>> --
>>> 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
>>>
>>
>>
>> --
>> WBR,
>> Eugene Prokopiev
>
>

-- 
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