--- asterisk/callerid.c.orig	2004-11-22 13:01:33.000000000 +0000
+++ asterisk/callerid.c	2004-11-22 13:01:59.000000000 +0000
@@ -43,6 +43,7 @@
 	int flags;
 	int sawflag;
 	int len;
+	int eaten;
 };
 
 
@@ -132,6 +133,7 @@
 		cid->fskd.cont = 0;			/* Digital PLL reset */
 		cid->fskd.x0 = 0.0;
 		cid->fskd.state = 0;
+		cid->eaten = 0;
 		memset(cid->name, 0, sizeof(cid->name));
 		memset(cid->number, 0, sizeof(cid->number));
 		cid->flags = CID_UNKNOWN_NAME | CID_UNKNOWN_NUMBER;
@@ -249,6 +251,12 @@
 		ast_log(LOG_WARNING, "Out of memory\n");
 		return -1;
 	}
+	cid->eaten += len;
+	if(cid->eaten > (8000 * 15)){ 
+	  /* we've eaten over 15 seconds of data */
+	  ast_log(LOG_ERROR, "Caller ID processed %d samples, giving up.\n", cid->eaten);
+	  return -1;	  
+	}
 	memset(buf, 0, 2 * len + cid->oldlen);
 	memcpy(buf, cid->oldstuff, cid->oldlen);
 	mylen += cid->oldlen/2;