* add more GSM 04.08 IEIs
* implement function for CHANNEL MODE MODIFY
* don't use hard-coded SETUP message but construct it with tlv functions
diff --git a/src/gsm_04_08.c b/src/gsm_04_08.c
index 602fbe2..7e80e29 100644
--- a/src/gsm_04_08.c
+++ b/src/gsm_04_08.c
@@ -32,6 +32,7 @@
#include <openbsc/db.h>
#include <openbsc/msgb.h>
+#include <openbsc/tlv.h>
#include <openbsc/debug.h>
#include <openbsc/gsm_data.h>
#include <openbsc/gsm_subscriber.h>
@@ -453,6 +454,30 @@
return gsm0408_loc_upd_acc(lchan, tmsi);
}
+/* 9.1.5 Channel mode modify */
+int gsm48_tx_chan_mode_modify(struct gsm_lchan *lchan, u_int8_t mode)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+ struct gsm48_chan_mode_modify *cmm =
+ (struct gsm48_chan_mode_modify *) msgb_put(msg, sizeof(*cmm));
+ u_int16_t arfcn = lchan->ts->trx->arfcn;
+
+ msg->lchan = lchan;
+ gh->proto_discr = GSM48_PDISC_RR;
+ gh->msg_type = GSM48_MT_RR_CHAN_MODE_MODIF;
+
+ /* fill the channel information element, this code
+ * should probably be shared with rsl_rx_chan_rqd() */
+ cmm->chan_desc.chan_nr = lchan2chan_nr(lchan);
+ cmm->chan_desc.h0.h = 0;
+ cmm->chan_desc.h0.arfcn_high = arfcn >> 8;
+ cmm->chan_desc.h0.arfcn_low = arfcn & 0xff;
+ cmm->mode = mode;
+
+ return gsm48_sendmsg(msg);
+}
+
/* Section 9.2.15a */
int gsm48_tx_mm_info(struct gsm_lchan *lchan)
{
@@ -682,6 +707,9 @@
subscr_put(subscr);
}
+ /* FIXME: somehow signal the completion of the PAGING to
+ * the entity that requested the paging */
+
return rc;
}
@@ -733,6 +761,11 @@
/* Call Control */
+/* The entire call control code is written in accordance with Figure 7.10c
+ * for 'very early assignment', i.e. we allocate a TCH/F during IMMEDIATE
+ * ASSIGN, then first use that TCH/F for signalling and later MODE MODIFY
+ * it for voice */
+
static int gsm48_cc_tx_status(struct gsm_lchan *lchan)
{
struct msgb *msg = gsm48_msgb_alloc();
@@ -775,13 +808,45 @@
return gsm48_cc_tx_status(msg->lchan);
}
-#if 0
static int gsm48_cc_rx_setup(struct msgb *msg)
{
- return gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
- GSM48_MT_CC_CALL_CONF);
+ struct gsm_call *call = &msg->lchan->call;
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ struct gsm_subscriber *called_subscr;
+ int ret;
+
+ if (call->state == GSM_CSTATE_NULL ||
+ call->state == GSM_CSTATE_RELEASE_REQ)
+ use_lchan(msg->lchan);
+
+ call->type = GSM_CT_MO;
+ call->state = GSM_CSTATE_INITIATED;
+ call->transaction_id = gh->proto_discr & 0xf0;
+
+ DEBUGP(DCC, "SETUP(tid=0x%02x)\n", call->transaction_id);
+
+ /* Parse the number that was dialed and lookup subscriber */
+ called_subscr = NULL;
+
+ if (!called_subscr) {
+ DEBUGP(DCC, "could not find subscriber, RELEASE\n");
+ put_lchan(msg->lchan);
+ return gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
+ GSM48_MT_CC_RELEASE_COMPL);
+ }
+
+ /* start paging of the receiving end of the call */
+ paging_request(msg->trx->bts, called_subscr, RSL_CHANNEED_TCH_F);
+
+ /* send a CALL PROCEEDING message to the MO */
+ ret = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
+ GSM48_MT_CC_CALL_PROC);
+
+ /* change TCH/F mode to voice */
+ return gsm48_tx_chan_mode_modify(msg->lchan, 0x01);
}
-#endif
+
+static const u_int8_t calling_bcd[] = { 0xb9, 0x83, 0x32, 0x24 };
int gsm48_cc_tx_setup(struct gsm_lchan *lchan)
{
@@ -789,7 +854,8 @@
struct gsm48_hdr *gh;
struct gsm_call *call = &lchan->call;
- gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 8);
+ gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 4 +
+ sizeof(calling_bcd));
call->type = GSM_CT_MT;
msg->lchan = lchan;
@@ -797,14 +863,9 @@
gh->proto_discr = GSM48_PDISC_CC;
gh->msg_type = GSM48_MT_CC_SETUP;
- gh->data[0] = 0x34;
- gh->data[1] = 0x00;
- gh->data[2] = 0x5c;
- gh->data[3] = 0x04;
- gh->data[4] = 0xb9;
- gh->data[5] = 0x83;
- gh->data[6] = 0x32;
- gh->data[7] = 0x24;
+ msgb_tv_put(msg, GSM48_IE_SIGNAL, GSM48_SIGNAL_DIALTONE);
+ msgb_tlv_put(msg, GSM48_IE_CALLING_BCD,
+ sizeof(calling_bcd), calling_bcd);
DEBUGP(DCC, "Sending SETUP\n");
@@ -860,15 +921,7 @@
GSM48_MT_CC_RELEASE);
break;
case GSM48_MT_CC_SETUP:
- if (call->state == GSM_CSTATE_NULL || call->state == GSM_CSTATE_RELEASE_REQ)
- use_lchan(msg->lchan);
- call->type = GSM_CT_MO;
- call->state = GSM_CSTATE_INITIATED;
- call->transaction_id = gh->proto_discr & 0xf0;
- DEBUGP(DCC, "SETUP(tid=0x%02x)\n", call->transaction_id);
- rc = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
- GSM48_MT_CC_CONNECT);
- /* FIXME: continue with CALL_PROCEEDING, ALERTING, CONNECT, RELEASE_COMPLETE */
+ rc = gsm48_cc_rx_setup(msg);
break;
case GSM48_MT_CC_EMERG_SETUP:
DEBUGP(DCC, "EMERGENCY SETUP\n");