Index: channels/chan_zap.c
===================================================================
RCS file: /usr/cvsroot/asterisk/channels/chan_zap.c,v
retrieving revision 1.161
diff -u -r1.161 chan_zap.c
--- channels/chan_zap.c	9 Jan 2004 05:26:27 -0000	1.161
+++ channels/chan_zap.c	9 Jan 2004 07:45:48 -0000
@@ -6148,7 +6148,7 @@
 #else
 							pri_release(pri->pri, e->ring.call, PRI_CAUSE_SWITCH_CONGESTION);
 #endif
-							pri->pvt[chan]->call = 0;
+							pri->pvt[chan]->call = NULL;
 						}
 					} else {
 						if ((!strlen(pri->pvt[chan]->exten) || ast_matchmore_extension(NULL, pri->pvt[chan]->context, pri->pvt[chan]->exten, 1, pri->pvt[chan]->callerid)) && !e->ring.complete)
@@ -6163,6 +6163,7 @@
 #else
 							pri_release(pri->pri, e->ring.call, PRI_CAUSE_UNALLOCATED);
 #endif
+							pri->pvt[chan]->call = NULL;
 						}
 					}
 				} else 
@@ -6171,6 +6172,7 @@
 #else
 					pri_release(pri->pri, e->ring.call, PRI_CAUSE_REQUESTED_CHAN_UNAVAIL);
 #endif
+					pri->pvt[chan]->call = NULL;
 				break;
 			case PRI_EVENT_RINGING:
 				chan = e->ringing.channel;