diff -ur asterisk-11.23.1-bak/channels/chan_sip.c asterisk-11.23.1/channels/chan_sip.c
--- asterisk-11.23.1-bak/channels/chan_sip.c	2016-10-12 17:06:08.747140795 -0500
+++ asterisk-11.23.1/channels/chan_sip.c	2016-10-12 17:08:51.446210140 -0500
@@ -9458,6 +9458,7 @@
 	int len = ast_str_strlen(data);
 	int h = 0, t = 0;
 	int lws = 0;
+	int rem, nl = 0;
 
 	for (; h < len;) {
 		/* Eliminate all CRs */
@@ -9470,6 +9471,13 @@
 			/* Check for end-of-message */
 			if (h + 1 == len)
 				break;
+			/* Check for start of body */
+			if (nl) {
+				rem = len - h;
+				memmove(msgbuf + t, msgbuf + h, rem);
+				h += rem; t += rem;
+				break;
+			}
 			/* Check for a continuation line */
 			if (msgbuf[h + 1] == ' ' || msgbuf[h + 1] == '\t') {
 				/* Merge continuation line */
@@ -9479,8 +9487,10 @@
 			/* Propagate LF and start new line */
 			msgbuf[t++] = msgbuf[h++];
 			lws = 0;
+			nl = 1;
 			continue;
 		}
+		nl = 0;
 		if (msgbuf[h] == ' ' || msgbuf[h] == '\t') {
 			if (lws) {
 				h++;