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

[Eugene Prokopiev]

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)
    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



-- 
WBR,
Eugene Prokopiev