Set default codec to PCMU in pjsip-perf

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@676 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjsip-apps/src/samples/pjsip-perf.c b/pjsip-apps/src/samples/pjsip-perf.c
index 5ec44af..c53a337 100644
--- a/pjsip-apps/src/samples/pjsip-perf.c
+++ b/pjsip-apps/src/samples/pjsip-perf.c
@@ -92,7 +92,7 @@
     "s=pjmedia\r\n"
     "c=IN IP4 192.168.0.68\r\n"
     "t=0 0\r\n"
-    "m=audio 4000 RTP/AVP 103 102 3 0 8 101\r\n"
+    "m=audio 4000 RTP/AVP 0 8 3 103 102 101\r\n"
     "a=rtcp:4001 IN IP4 192.168.0.68\r\n"
     "a=rtpmap:103 speex/16000\r\n"
     "a=rtpmap:102 speex/8000\r\n"