Index: channels/chan_sip.c
===================================================================
RCS file: /usr/cvsroot/asterisk/channels/chan_sip.c,v
retrieving revision 1.803
diff -u -r1.803 chan_sip.c
--- channels/chan_sip.c	4 Aug 2005 20:03:45 -0000	1.803
+++ channels/chan_sip.c	9 Aug 2005 11:58:14 -0000
@@ -11030,8 +11093,8 @@
 		} else if (!strcasecmp(v->name, "recordhistory")) {
 			recordhistory = ast_true(v->value);
 		} else if (!strcasecmp(v->name, "tos")) {
-			if (sscanf(v->value, "%d", &format) == 1)
-				tos = format & 0xff;
+			if (!strcmp(v->value, "0") || !strcmp(v->value, "0x0") || strtoul(v->value, NULL, 0) > 0)
+				tos = strtoul(v->value, NULL, 0) & 0xff;
 			else if (!strcasecmp(v->value, "lowdelay"))
 				tos = IPTOS_LOWDELAY;
 			else if (!strcasecmp(v->value, "throughput"))