rtp.nse.patch

--- rtp.h.orig	Fri Sep 22 11:22:03 2006
+++ rtp.h	Thu Oct 12 22:34:44 2006
@@ -45,8 +45,10 @@
 #define AST_RTP_CN              	(1 << 1)
 /*! DTMF (Cisco Proprietary) */
 #define AST_RTP_CISCO_DTMF      	(1 << 2)
+/*! NSE (Cisco Proprietary) */
+#define AST_RTP_CISCO_NSE		(1 << 3)
 /*! Maximum RTP-specific code */
-#define AST_RTP_MAX             	AST_RTP_CISCO_DTMF
+#define AST_RTP_MAX             	AST_RTP_CISCO_NSE
 
 #define MAX_RTP_PT			256
 
--- rtp.c.orig	Mon Oct  9 16:30:15 2006
+++ rtp.c	Thu Oct 12 22:32:18 2006
@@ -677,6 +677,34 @@
 	return f;
 }
 
+static struct ast_frame *process_cisco_nse(struct ast_rtp *rtp, unsigned char *data, int len)
+{
+	unsigned int event;
+	static struct ast_frame null_frame = { AST_FRAME_NULL, };
+
+	event = ntohl(*((unsigned int *)(data)));
+	event >>= 24;
+	event &= 0xff;
+
+	/* Print out debug if turned on */
+	if (rtpdebug || option_debug > 2)
+		ast_log(LOG_DEBUG, "Cisco NSE Event: %08x (len = %d)\n", event, len);
+
+	return &null_frame;
+
+	/*	event
+		32	Fax Mode, CED tone Detected (RFC2833)
+		34	Modem Mode, ANSam tone Detected (RFC2833)
+		192	Up-Speed, CED tone Detected
+		193	ECAN OFF, Phase Reversal Detected
+		194	ECAN ON, Silence Detected
+		200	T38 Fax Mode, V.21 Detected
+		201	T38 Fax Mode ACK
+		202	T38 Fax Mode NACK
+		203	Modem Relay Mode, CM Tone Detected
+	*/
+}
+
 /*! 
  * \brief Process RTP DTMF and events according to RFC 2833.
  * 
@@ -1263,6 +1291,12 @@
 				f = process_cisco_dtmf(rtp, rtp->rawdata + AST_FRIENDLY_OFFSET + hdrlen, res - hdrlen);
 				rtp->lasteventseqn = seqno;
 			}
+		} else if (rtpPT.code == AST_RTP_CISCO_NSE) {
+			/* It's really special -- process it the Cisco way */
+			if (rtp->lasteventseqn <= seqno || (rtp->lasteventseqn >= 65530 && seqno <= 6)) {
+				f = process_cisco_nse(rtp, rtp->rawdata + AST_FRIENDLY_OFFSET + hdrlen, res - hdrlen);
+				rtp->lasteventseqn = seqno;
+			}
 		} else if (rtpPT.code == AST_RTP_CN) {
 			/* Comfort Noise */
 			f = process_rfc3389(rtp, rtp->rawdata + AST_FRIENDLY_OFFSET + hdrlen, res - hdrlen);
@@ -1333,6 +1367,7 @@
 	{{1, AST_FORMAT_G726_AAL2}, "audio", "AAL2-G726-32"},
 	{{0, AST_RTP_DTMF}, "audio", "telephone-event"},
 	{{0, AST_RTP_CISCO_DTMF}, "audio", "cisco-telephone-event"},
+	{{0, AST_RTP_CISCO_NSE}, "audio", "cisco-nse-event"},
 	{{0, AST_RTP_CN}, "audio", "CN"},
 	{{1, AST_FORMAT_JPEG}, "video", "JPEG"},
 	{{1, AST_FORMAT_PNG}, "video", "PNG"},