aded ntkeepcalls option, to avoid droÃpping calls when the L2 goes down on a PTP link. There are some pbx which do turn off the L1 for a very short while and restart it immediately. normally T310 should be started and after 10 seconds or so the calls should be dropped, this is a simple fix wihtout this timer.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@89169 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_misdn.c

@@ -4997,7 +4997,7 @@ static int load_module(void)
 		chan_misdn_log(0, 0, "Got: %s from get_ports\n",ports);
 	
 	{
-		int ntflags=0;
+		int ntflags=0, ntkc=0;
 		char ntfile[BUFFERSIZE+1];
 		struct misdn_lib_iface iface = {
 			.cb_event = cb_events,
@@ -5013,6 +5013,9 @@ static int load_module(void)
 
 		misdn_lib_nt_debug_init(ntflags,ntfile);
 
+
+		misdn_cfg_get( 0, MISDN_GEN_NTKEEPCALLS, &ntkc, sizeof(int));
+		misdn_lib_nt_keepcalls(ntkc);
 	}
 
 	{

channels/misdn/chan_misdn_config.h

@@ -97,6 +97,7 @@ enum misdn_cfg_elements {
 	MISDN_GEN_DYNAMIC_CRYPT,       /* int (bool) */
 	MISDN_GEN_CRYPT_PREFIX,        /* char[] */
 	MISDN_GEN_CRYPT_KEYS,          /* char[] */
+	MISDN_GEN_NTKEEPCALLS,          /* int (bool) */
 	MISDN_GEN_NTDEBUGFLAGS,          /* int */
 	MISDN_GEN_NTDEBUGFILE,          /* char[] */
 	MISDN_GEN_LAST

channels/misdn/isdn_lib.c

@@ -2744,11 +2744,13 @@ static int handle_l1(msg_t *msg)
 	case PH_DEACTIVATE | INDICATION:
 		cb_log (3, stack->port, "L1: PH L1Link Down! \n");
 	
+#if 0
 		for (i=0; i<=stack->b_num; i++) {
 			if (global_state == MISDN_INITIALIZED)  {
 				cb_event(EVENT_CLEANUP, &stack->bc[i], glob_mgr->user_data);
 			}
 		}
+#endif
 		
 		if (stack->nt) {
 			if (stack->nst.l1_l2(&stack->nst, msg))
@@ -2850,7 +2852,9 @@ static int handle_mgmt(msg_t *msg)
 		case SSTATUS_L1_DEACTIVATED:
 			cb_log(3, 0, "MGMT: SSTATUS: L1_DEACTIVATED \n");
 			stack->l1link=0;
+#if 0
 			clear_l3(stack);
+#endif
 			break;
 
 		case SSTATUS_L2_ESTABLISHED:
@@ -3857,6 +3861,18 @@ int misdn_lib_maxports_get() { /** BE AWARE WE HAVE NO CB_LOG HERE! **/
 }
 
 
+void misdn_lib_nt_keepcalls( int kc)
+{
+#ifdef FEATURE_NET_KEEPCALLS
+	if (kc) {
+		struct misdn_stack *stack=get_misdn_stack();
+		for ( ; stack; stack=stack->next) {
+			stack->nst.feature |= FEATURE_NET_KEEPCALLS;
+		}
+	}
+#endif
+}
+
 void misdn_lib_nt_debug_init( int flags, char *file ) 
 {
 	int static init=0;

channels/misdn/isdn_lib.h

@@ -381,6 +381,8 @@ struct misdn_lib_iface {
 
 /***** USER IFACE **********/
 
+void misdn_lib_nt_keepcalls(int kc);
+
 void misdn_lib_nt_debug_init( int flags, char *file );
 
 int misdn_lib_init(char *portlist, struct misdn_lib_iface* iface, void *user_data);

channels/misdn_config.c

@@ -358,6 +358,10 @@ static const struct misdn_cfg_spec gen_spec[] = {
 	{ "crypt_keys", MISDN_GEN_CRYPT_KEYS, MISDN_CTYPE_STR, NO_DEFAULT, NONE,
 		"Keys for cryption, you reference them in the dialplan\n"
 		"\tLater also in dynamic encr." },
+ 	{ "ntkeepcalls", MISDN_GEN_NTKEEPCALLS, MISDN_CTYPE_BOOL, "no", NONE, 
+		"avoid dropping calls if the L2 goes down. some nortel pbx\n" 
+		"do put down the L2/L1 for some milliseconds even if there\n"
+		"are running calls. with this option you can avoid dropping them\n" },
 	{ "ntdebugflags", MISDN_GEN_NTDEBUGFLAGS, MISDN_CTYPE_INT, "0", NONE,
 	  	"No description yet."},
 	{ "ntdebugfile", MISDN_GEN_NTDEBUGFILE, MISDN_CTYPE_STR, "/var/log/misdn-nt.log", NONE,

configs/misdn.conf.sample

@@ -56,6 +56,12 @@ debug=0
 ntdebugflags=0
 ntdebugfile=/var/log/misdn-nt.log
 
+
+; some pbx systems do cut the L1 for some milliseconds, to avoid 
+; dropping running calls, we can set this flag to yes and tell
+; mISDNuser not to drop the calls on L2_RELEASE
+ntkeepcalls=no
+
 ; the big trace
 ;
 ; default value: [not set]