Index: chan_sip.c
===================================================================
--- chan_sip.c	(revision 12369)
+++ chan_sip.c	(working copy)
@@ -598,6 +598,7 @@
 #define SIP_PAGE2_DEBUG_CONSOLE 	(1 << 6)
 #define SIP_PAGE2_DYNAMIC		(1 << 7)	/*!< Dynamic Peers register with Asterisk */
 #define SIP_PAGE2_SELFDESTRUCT		(1 << 8)	/*!< Automatic peers need to destruct themselves */
+#define SIP_PAGE2_HIDE_SILENCESUPP	(1 << 9)	/*!< Show/Hide silenceSupp=off from SDP Header */
 
 /* SIP packet flags */
 #define SIP_PKT_DEBUG		(1 << 0)	/*!< Debug this packet */
@@ -661,6 +662,7 @@
 	unsigned int flags;			/*!< SIP_ flags */	
 	int timer_t1;				/*!< SIP timer T1, ms rtt */
 	unsigned int sipoptions;		/*!< Supported SIP sipoptions on the other end */
+	int hide_silencesupp;			/*!< Show/Hide SilenceSupp */
 	int capability;				/*!< Special capability (codec) */
 	int jointcapability;			/*!< Supported capability at both ends (codecs ) */
 	int peercapability;			/*!< Supported peer capability */
@@ -1966,7 +1968,11 @@
 	r->rtpkeepalive = peer->rtpkeepalive;
 	if (peer->call_limit)
 		ast_set_flag(r, SIP_CALL_LIMIT);
-
+	if (ast_test_flag(&peer->flags_page2, SIP_PAGE2_HIDE_SILENCESUPP)) {
+		r->hide_silencesupp = TRUE;
+	} else {
+		r->hide_silencesupp = FALSE;
+	}
 	return 0;
 }
 
@@ -4609,9 +4615,10 @@
 				    &a_audio_next, &a_audio_left,
 				    debug);
 	}
-
-	ast_build_string(&a_audio_next, &a_audio_left, "a=silenceSupp:off - - - -\r\n");
-
+	/* Show hide silenceSupp from header */
+	if (!p->hide_silencesupp) {
+		ast_build_string(&a_audio_next, &a_audio_left, "a=silenceSupp:off - - - -\r\n");
+	}  
 	if ((m_audio_left < 2) || (m_video_left < 2) || (a_audio_left == 0) || (a_video_left == 0))
 		ast_log(LOG_WARNING, "SIP SDP may be truncated due to undersized buffer!!\n");
 
@@ -7594,8 +7601,8 @@
 	regex_t regexbuf;
 	int havepattern = FALSE;
 
-#define FORMAT2 "%-25.25s  %-15.15s %-3.3s %-3.3s %-3.3s %-8s %-10s\n"
-#define FORMAT  "%-25.25s  %-15.15s %-3.3s %-3.3s %-3.3s %-8d %-10s\n"
+#define FORMAT2 "%-25.25s  %-15.15s %-3.3s %-3.3s %-3.3s %-3.3s %-8s %-10s\n"
+#define FORMAT  "%-25.25s  %-15.15s %-3.3s %-3.3s %-3.3s %-3.3s %-8d %-10s\n"
 
 	char name[256];
 	char iabuf[INET_ADDRSTRLEN];
@@ -7626,7 +7633,7 @@
 	}
 
 	if (!s) { /* Normal list */
-		ast_cli(fd, FORMAT2, "Name/username", "Host", "Dyn", "Nat", "ACL", "Port", "Status");
+		ast_cli(fd, FORMAT2, "Name/username", "Host", "Dyn", "Nat", "ACL", "HsS", "Port", "Status");
 	} 
 	
 	ASTOBJ_CONTAINER_TRAVERSE(&peerl, 1, do {
@@ -7667,6 +7674,7 @@
 			ast_test_flag((&iterator->flags_page2), SIP_PAGE2_DYNAMIC) ? " D " : "   ", 	/* Dynamic or not? */
 			(ast_test_flag(iterator, SIP_NAT) & SIP_NAT_ROUTE) ? " N " : "   ",	/* NAT=yes? */
 			iterator->ha ? " A " : "   ", 	/* permit/deny */
+			ast_test_flag((&iterator->flags_page2),SIP_PAGE2_HIDE_SILENCESUPP) ? "yes" : "no", /* Hide SilenceSupp from header */
 			ntohs(iterator->addr.sin_port), status);
 
 		if (!s)  {/* Normal CLI list */
@@ -7675,7 +7683,7 @@
 			ast_test_flag((&iterator->flags_page2), SIP_PAGE2_DYNAMIC) ? " D " : "   ", 	/* Dynamic or not? */
 			(ast_test_flag(iterator, SIP_NAT) & SIP_NAT_ROUTE) ? " N " : "   ",	/* NAT=yes? */
 			iterator->ha ? " A " : "   ",       /* permit/deny */
-			
+			ast_test_flag((&iterator->flags_page2),SIP_PAGE2_HIDE_SILENCESUPP) ? "yes" : "no", /* Hide SilenceSupp from header */
 			ntohs(iterator->addr.sin_port), status);
 		} else {	/* Manager format */
 			/* The names here need to be the same as other channels */
@@ -7689,6 +7697,7 @@
 			"Dynamic: %s\r\n"
 			"Natsupport: %s\r\n"
 			"ACL: %s\r\n"
+			"HideSilenceSupp: %s\r\n"
 			"Status: %s\r\n\r\n", 
 			idtext,
 			iterator->name, 
@@ -7697,6 +7706,7 @@
 			ast_test_flag((&iterator->flags_page2), SIP_PAGE2_DYNAMIC) ? "yes" : "no", 	/* Dynamic or not? */
 			(ast_test_flag(iterator, SIP_NAT) & SIP_NAT_ROUTE) ? "yes" : "no",	/* NAT=yes? */
 			iterator->ha ? "yes" : "no",       /* permit/deny */
+			ast_test_flag((&iterator->flags_page2),SIP_PAGE2_HIDE_SILENCESUPP) ? "yes" : "no", /* Hide SilenceSupp from header */
 			status);
 		}
 
@@ -12300,6 +12310,12 @@
 				ast_log(LOG_WARNING, "Qualification of peer '%s' should be 'yes', 'no', or a number of milliseconds at line %d of sip.conf\n", peer->name, v->lineno);
 				peer->maxms = 0;
 			}
+		} else if (!strcasecmp(v->name, "hidesilencesupp")) {
+			if (!strcasecmp(v->value, "yes")) {
+				ast_set_flag((&peer->flags_page2), SIP_PAGE2_HIDE_SILENCESUPP);
+			} else if (strcasecmp(v->value, "no")) {
+				ast_log(LOG_WARNING, "hidesilencesupp bad param on %s just use: 'yes' or 'no'\n", peer->name);
+			}
 		}
 	}
 	if (!ast_test_flag((&global_flags_page2), SIP_PAGE2_IGNOREREGEXPIRE) && ast_test_flag((&peer->flags_page2), SIP_PAGE2_DYNAMIC) && realtime) {