[OpenSIPS-Users] need advice on B2b

Fri Jan 8 03:20:03 CET 2010

HI Anca

it is clear now :)
i am trying to learn the opensips,

Thank you
Ha`

--- On Wed, 1/6/10, Anca Vamanu <anca at opensips.org> wrote:

From: Anca Vamanu <anca at opensips.org>
Subject: Re: [OpenSIPS-Users] need advice on B2b
To: "OpenSIPS users mailling list" <users at lists.opensips.org>
Date: Wednesday, January 6, 2010, 3:14 AM

Hi Ha`,

The excerpt from your script shows that you don't have a good
understanding of the opensips scripting logic. First, the route
block will only be called for SIP Requests. 

Calling this is not right:

             if(status=="200")

                        route("b2b_reply");

The replies will go into reply route blocks. You can have a default
reply route ( one without an index or with index 0), or you can specify
a certain reply route for a request by calling  t_on_reply.

Second, you don't understand what happens with b2b request and replies.
It is explained in the documentation:

The requests and replies that are received by the B2BUA server,
belonging to the dialogs it is handling will not go into the script as
normal request do. The reason for this is that this are not normal
requests where the server is a proxy, but the server is an endpoint in
the dialog and therefore they should not go through the same routes.
However, it is normal for this request to be seen from the script and
allow the script writer to do the processing it desires based on them.
For this, it is possible to define two special B2B routes - one for
requests and one for replies. The routes are of type route
and have their name defined in the modules parameters script_req_route
and script_reply_route.

In other words, there are two important things:

1. the B2B requests/replies will not go into the default request/reply
route block. 

2. the b2b_request/b2_reply route will be called automatically for
every request/reply targeted to the b2b agent

So, for your script, you don't need this lines:

     if(is_method("INVITE")) {

                route("b2b_request");

                t_on_reply("2");

        }

        else

                if(status=="200")

                        route("b2b_reply");

Hope this made things a bit clearer.

Regards,

-- 
Anca Vamanu
www.voice-system.ro

ha do wrote:

        HI Anca

i am trying to use the b2b_request + b2b_reply

route{

...

if(is_method("INVITE") &&  !(src_ip == 192.168.1.249 &&
src_port ==5060)) 

        {

                if (! t_newtran()){

                        sl_reply_error();

                        exit;

                };

                b2b_init_request("top hiding");

                exit;

        };

....

route("1");

}

route[1] {

        if(is_method("INVITE")) {

                route("b2b_request");

                t_on_reply("2");

        }

        else

                if(status=="200")

                        route("b2b_reply");

        if (!t_relay()) {

                sl_reply_error();

        };

        exit;

}

route[b2b_request] {

  xlog("b2b_request cucku ($ci)\n");

        force_rtp_proxy();

}

route[b2b_reply] {

  xlog("b2b_reply cucku ($ci)\n");

        force_rtp_proxy();

}

i get the errors :  

ERROR:nathelper:force_rtp_proxy: Unable to parse body 

and

 DBG:tm:utimer_routine: timer routine:4,tl=0xb615e9a8 next=(nil),
timeout=29000000

 DBG:tm:timer_routine: timer routine:3,tl=0xb615c6f4 next=(nil),
timeout=29

 DBG:tm:delete_handler: removing 0xb615c690

 DBG:tm:delete_cell: delete_cell 0xb615c690: can't delete -- still
reffed (1)

=======

 DBG:core:get_hdr_field: cseq <CSeq>: <2> <INVITE>

 DBG:core:parse_headers: flags=8

 DBG:tm:t_reply_matching: hash 21530 label 76806763 branch 0

 DBG:tm:t_reply_matching: REF_UNSAFE: after is 2

 DBG:tm:t_reply_matching: reply matched (T=0xb615e85c)!

 DBG:tm:t_check: end=0xb615e85c

 DBG:tm:reply_received: org. status uas=0, uac[0]=100 local=2
is_invite=1)

 DBG:tm:t_should_relay_response: T_code=0, new_code=180

 DBG:tm:local_reply: branch=0, save=0, winner=0

 DBG:tm:local_reply: Passing provisional reply 180 to FIFO application

 DBG:tm:run_trans_callbacks: trans=0xb615e85c, callback type 1024, id 0
entered

 DBG:b2b_entities:b2b_parse_key: hash_index = [111]  - local_index= [0]

 DBG:core:parse_headers: flags=ffffffffffffffff

 DBG:core:get_hdr_field: content_length=0

 DBG:core:get_hdr_field: found end of header

 DBG:b2b_entities:b2b_tm_cback: Received a reply with statuscode = 180

 DBG:core:parse_headers: flags=ffffffffffffffff

 DBG:b2b_entities:b2b_new_dlg: 'To' header ALREADY PARSED:
<sip:1012 at 192.168.1.249>

 DBG:b2b_entities:b2b_new_dlg: Not an initial request

 DBG:core:parse_to_param: tag=bfad35cdb22f09f741816636d344f54b-19f0

 DBG:core:parse_to: end of header reached, state=29

 DBG:core:parse_to: display={},
ruri={sip:0873000003 at 192.168.1.249;user=phone}

 DBG:core:print_rr_body: current rr is <sip:192.168.1.249;lr=on>

 DBG:core:print_rr_body: out rr [<sip:192.168.1.249;lr=on>]

 DBG:core:print_rr_body: we have 1 records

 DBG:b2b_entities:b2b_tm_cback: Created new dialog structure 0xb61618c0

 DBG:core:print_rr_body: current rr is <sip:192.168.1.249;lr=on>

 DBG:core:print_rr_body: out rr [<sip:192.168.1.249;lr=on>]

 DBG:core:print_rr_body: we have 1 records

 DBG:b2b_logic:b2bl_parse_key: hash_index = [623]  - local_index= [0]

 DBG:core:parse_headers: flags=ffffffffffffffff

 DBG:b2b_entities:b2b_parse_key: hash_index = [346]  - local_index= [0]

 DBG:core:parse_headers: flags=ffffffffffffffff

 DBG:core:check_ip_address: params 192.168.1.4, 192.168.1.4, 0

 DBG:tm:t_reply_with_body: buffer computed

 DBG:tm:_reply_light: reply sent out. buf=0x81c70b8: SIP/2.0 1...,
shmem=0xb615e534: SIP/2.0 1

 DBG:tm:_reply_light: finished

 b2b_reply cucku (B2B.111.0.1262765386)

 DBG:core:parse_headers: flags=ffffffffffffffff

 DBG:core:parse_headers: flags=1000

 DBG:core:parse_content_type_hdr: missing Content-Type header

 ERROR:nathelper:force_rtp_proxy: Unable to parse body

Thank you

Ha`

--- On Mon, 1/4/10, Anca Vamanu <anca at opensips.org>
wrote:

From: Anca Vamanu <anca at opensips.org>

Subject: Re: [OpenSIPS-Users] need advice on B2b

To: "OpenSIPS users mailling list" <users at lists.opensips.org>

Date: Monday, January 4, 2010, 3:04 AM

          Hi Ha`,

There is a very simple example in the documentation:

route[b2b_request] {

  xlog("b2b_request ($ci)\n");

}

route[b2b_reply] {

  xlog("b2b_reply ($ci)\n");

}

You can call in these routes any function that you call in a request
route.

Regards,

-- 

Anca Vamanu

www.voice-system.ro

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