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supplementary service call control during a call

 
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mwiget



Joined: 07 Sep 2008
Posts: 3
PostPosted: Mon Sep 15, 2008 11:07 am    Post subject: supplementary service call control during a call Reply with quote
Hi,

I'm trying to get control over supplementary services initiated by the ME during a call (hold, transfer), but it doesn't seem to trigger the action call control. When I'm not in a call and query e.g. call forwarding status, ACTION_CALL_CONTROL gets triggered.

I couldn't find any hints in the standards doc describing a different behavior regarding call control before and during a call.

Interesting enough, when I initiate a call transfer by dialing a second call (while the first is on hold), I do get a call_control trigger, but for the additional call, not the supplementary service (which puts the previous call on hold).

What am I missing here? Tried two different handset manufacturers. Are call hold and transfer handled directly by the ME?

Thanks
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pz
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PostPosted: Wed Sep 17, 2008 5:46 am    Post subject: Reply with quote
This can be device depending - what phones do you have? Do you have terminal profiles? What is the terminal response of the send_ss commands?
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mwiget



Joined: 07 Sep 2008
Posts: 3
PostPosted: Wed Sep 17, 2008 6:04 am    Post subject: Reply with quote
pz wrote:
This can be device depending - what phones do you have? Do you have terminal profiles? What is the terminal response of the send_ss commands?

Motorola Razr v3i, TP AF FF FF FF FF 0F 1F 1F 7F 00 00 1F 23 88 9A 03 03
iphone 3G 2.1: TP FF 9F FF FF 7F 01 00 DF BF 00 00 00 00 00 80 02

Haven't tried to use send_ss yet, I'm trying to intercept the ME for now, which works unless I'm on a call.

Will check functionality with additional phones I have available.
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mwiget



Joined: 07 Sep 2008
Posts: 3
PostPosted: Sun Sep 21, 2008 5:29 pm    Post subject: sample test code for supplementary service trigger Reply with quote
here's a little dummy test program that explores the problem. Call control gets triggered with a TLV of T_SS_STRING when querying e.g. the status of call divertion, but there is no such trigger when doing a call transfer or put the call on hold or resume.

I assumed both should also trigger such events. Maybe I'm wrong?


Code:

/*
  simple app to show when call-control gets called
  and if it contains a SS, USSD or ADDRESS Tag

  This should bring a popup message, or, wenn compiled
  with DEBUG, a debug message via programmer, whenever
  call control gets called.
*/

#include <config.h>
#include <turbo/turbo.h>

#include <stdlib.h>
#include <string.h>

#define NUMBER_BUFFER_SIZE  50

static lc_char PROGMEM lc_SS[]={
        LC_EN("SS!")
        LC_END
};

static lc_char PROGMEM lc_USSD[]={
        LC_EN("USSD!")
        LC_END
};

static lc_char PROGMEM lc_ADDRESS[]={
        LC_EN("ADDRESS!")
        LC_END
};

u8 *get_resp_call;
u8 get_resp_call_len;

#define CALL_STAT_ALLOW         0x00
#define CALL_STAT_CANCEL        0x01
#define CALL_STAT_MODIFY        0x02

void bum (void * x)
{
    u8  *res;
      display_text_raw (x, Q_DISPLAY_TEXT_HIGH_PRIORITY |
            Q_DISPLAY_TEXT_DELAY_CLEAR);
}

void call_control (u8 * s)
{
  u8 j;
  u8 stat;
  u16 ret;

  get_resp_call_len = 0;
  stat = CALL_STAT_ALLOW;

  j = get_tag (s, T_SS_STRING);
  if (j != 0)
#ifdef DEBUG
    dbsp("T_SS_STRING\n");
#else
    stk_thread(bum, locale(lc_SS));
#endif

  j = get_tag (s, T_USSD_STRING);
  if (j != 0)
#ifdef DEBUG
    dbsp("T_SS_STRING\n");
#else
    stk_thread(bum, locale(lc_USSD));
#endif

  j = get_tag (s, T_ADDRESS);
  if (j != 0)
#ifdef DEBUG
    dbsp("T_SS_STRING\n");
#else
    stk_thread(bum, locale(lc_ADDRESS));
#endif

  if (stat == CALL_STAT_ALLOW)
  {
    get_resp_call[get_resp_call_len] = CALL_STAT_ALLOW;
    get_resp_call_len++;
    get_resp_call[get_resp_call_len] = 0x00;
    get_resp_call_len++;
  }

  if (stat == CALL_STAT_CANCEL)
  {
    get_resp_call[get_resp_call_len] = CALL_STAT_CANCEL;
    get_resp_call_len++;
    get_resp_call[get_resp_call_len] = 0x00;
    get_resp_call_len++;
  }

  ret = 0x9F00 | get_resp_call_len;

  get_resp_call[get_resp_call_len] = 0x90;
  get_resp_call_len++;
  get_resp_call[get_resp_call_len] = 0x00;
  get_resp_call_len++;

  retval (ret);
}

/* -------------------------------------------------------------------- */
void turbo_handler (u8 action, void *data)
{
  switch (action)
  {
    case ACTION_APP_INIT:
      get_resp_call = malloc (NUMBER_BUFFER_SIZE);
      reg_action (ACTION_CALL_CONTROL);
      break;

    case ACTION_CALL_CONTROL:
      call_control (data);
      break;

    case ACTION_FILE_APDU:

      if (((File_apdu_data *) data)->prev_ins == ME_CMD_ENVELOPE
     && ((File_apdu_data *) data)->ins == ME_CMD_GET_RESPONSE)
      {
   u8 *r = buf_B ();
   u8 i;

   for (i = 0; i < get_resp_call_len; i++)
     r[i] = get_resp_call[i];
      }
      break;

    default:
      break;
  }
}
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pz
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PostPosted: Tue Sep 30, 2008 12:36 pm    Post subject: Reply with quote
I did some tests myself and it seems that those services related to call on hold/transfer are not accessible - you cannot initiate them and are not reported with call control. I don't know where this is specified though - in what standard. Quite a pity - could be used to many nice things.
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