diff -u -r1.510 chan_sip.c
--- channels/chan_sip.c 28 Sep 2004 12:55:08 -0000      1.510
+++ channels/chan_sip.c 11 Oct 2004 15:24:40 -0000
@@ -2698,7 +2698,12 @@
        sdpLineNum_iterator_init(&iterator);
        p->novideo = 1;
        while ((m = get_sdp_iterate(&iterator, req, "m"))[0] != '\0') {
-               if ((sscanf(m, "audio %d RTP/AVP %n", &x, &len) == 1)) {
+               int nconversions;
+
+               nconversions = sscanf(m, "audio %d RTP/AVP %n", &x, &len);
+               if (nconversions < 1)
+                       nconversions = sscanf(m, "audio %d/1 RTP/AVP %n", &x, &len);
+               if (nconversions == 1) {
                        portno = x;
                        /* Scan through the RTP payload types specified in a "m=" line: */
                        ast_rtp_pt_clear(p->rtp);