Skinny: off_hook_message doesn't include call_id on older phones

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@16876 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/endpoints/mod_skinny/skinny_protocol.h

@@ -80,7 +80,7 @@ struct stimulus_message {
 #define OFF_HOOK_MESSAGE 0x0006
 struct off_hook_message {
 	uint32_t line_instance;
-	uint32_t call_id;
+	/* uint32_t call_id; */
 };
 
 /* OnHookMessage */