Initial conference implementation

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@205 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjmedia/src/pjmedia-codec/gsm.c b/pjmedia/src/pjmedia-codec/gsm.c
index 3ef6dac..fa14873 100644
--- a/pjmedia/src/pjmedia-codec/gsm.c
+++ b/pjmedia/src/pjmedia-codec/gsm.c
@@ -20,6 +20,7 @@
 #include <pjmedia/codec.h>
 #include <pjmedia/errno.h>
 #include <pjmedia/endpoint.h>
+#include <pjmedia/port.h>
 #include <pj/assert.h>
 #include <pj/pool.h>
 #include <pj/string.h>