[Freeswitch-users] sip_ph_X- header doesn't work for freetdm-sofiacall

[xiaofengcanyuexp at 163.com]

Anyone knows about this problem? It's appreciated.
 				
>-----Original Message-----
>From: xiaofengcanyuexp [mailto:freeswitch-users at lists.freeswitch.org] 
>Sent: 2013-05-28  00:47:54
>Cc: 
>Subject: [Freeswitch-users] sip_ph_X- header doesn't work for freetdm-sofiacall

>Dear support
>
>I got a problem to pass through SS7 info in SIP messages. Here is the code change and test call flow:
>--------------------
>Code change and log:
>--------------------
>1. At sangoma module:intercept ACM in ftmod_sangoma_ss7_*.c, parse the BCI and add it to the ftdmchan->call_data:
>	sngss7_add_var(sngss7_info, "ss7_acm_bci_hex", val);
>
>2. At freetdm  module mod_freetdm.c, get the variable and set it to channel. Of which, the "prefix" is 'sip_ph_X-':
>	var_value = ftdm_sigmsg_get_var(sigmsg, "ss7_acm_bci_hex");
>	if (!ftdm_strlen_zero(var_value)) 
>	{
>		snprintf(variable_name, "%sTEST-BCI-HEX", prefix);
>		switch_channel_set_variable_printf(channel, variable_name, "%s", var_value);
>	}
>
>>From the test call log:
>
>2013-05-27 07:03:47.747361 [INFO] ftmod_sangoma_ss7_handle.c:362 [s1c1][1:1] [CIC:1]Rx ACM
>2013-05-27 07:03:47.747361 [DEBUG] ftmod_sangoma_ss7_support.c:2920 [s1c1][1:1] ACM BCI parameter Hex: 0x1636
>2013-05-27 09:00:47.127357 [DEBUG] mod_freetdm.c:5513 Get ACM BCI parameter from sangoma
>2013-05-27 09:00:47.127357 [DEBUG] mod_freetdm.c:5530 sip_ph_X-TEST-BCI-HEX:1636
>---------------------
>My purpose:
>---------------------
>What I want to do is the encapsulate the sip_ph_X-TEST-BCI-HEX in the 183 SIP message. Like handling IAM  in ftdm_channel_from_event(),
>once it sets the the variable like below, the  "X-FreeTDM-SpanNumber" will automatically attached in INVITE message.
>         switch_channel_set_variable_printf(channel, "sip_h_X-FreeTDM-SpanNumber", "%d", spanid); 
>
>---------------------
>Problems:
>---------------------
>While, what's strange are:
>1. I add one line in dialplan/default.xml to log the variable with:
>    <action application="log" data="The BCI hex is: ${sip_ph_X-TRUSTID-BCI-HEX}"/>
>    The freeswitch.log show ${sip_ph_X-TRUSTID-BCI-HEX} is empty
>2. The 183 message does not attach the  'X-TRUSTID-BCI-HEX'. 
>
>Can someone help to figure out what's wrong with it?
>
>Thanks
>-------------------
>2013-05-28
>
>
>
>
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