diff -ruN asterisk-1.0.7-old/rtp.c asterisk-1.0.7-new/rtp.c
--- asterisk-1.0.7-old/rtp.c	2005-01-19 03:33:54.000000000 +0100
+++ asterisk-1.0.7-new/rtp.c	2005-05-16 19:40:02.000000000 +0200
@@ -1048,6 +1048,7 @@
 			rtpheader[3] |= htonl((800));
 			/* Set the End bit for the last 3 */
 			rtpheader[3] |= htonl((1 << 23));
+			rtpheader[1] = htonl(++(rtp->lastts)); /* added for Sipura SPA-3000 compat. */
 		} else if ( x < 5) {
 			rtpheader[0] = htonl((2 << 30) | (payload << 16) | (rtp->seqno++));
 		}