Index: channels/misdn_config.c
===================================================================
--- channels/misdn_config.c	(revision 211731)
+++ channels/misdn_config.c	(working copy)
@@ -1001,6 +1001,11 @@
 	}
 
 	for (i = 0; i < (max_ports + 1); ++i) {
+		if (i > 0 && cfg_for_ports[0]) {
+			/* default category, will populate the port_cfg with additional port
+			categories in subsequent calls to this function */
+			memset(cfg_tmp, 0, sizeof(cfg_tmp));
+		}
 		if (cfg_for_ports[i]) {
 			memcpy(port_cfg[i], cfg_tmp, sizeof(cfg_tmp));
 		}