gprs_ns2_vty: udp: fixup dialect changes

Only accept receiving ipaccess style messages when use-reset-block
is selected.
If use-reset-block is disabled allow static NSVCs.

Change-Id: Ia787528b1a6fac6bf1570c21643ef6cd8c209108
diff --git a/src/gb/gprs_ns2_vty.c b/src/gb/gprs_ns2_vty.c
index 742f181..e33869b 100644
--- a/src/gb/gprs_ns2_vty.c
+++ b/src/gb/gprs_ns2_vty.c
@@ -901,7 +901,8 @@
 			/* TODO: could not bind on the specific address */
 			return -1;
 		}
-		bind->accept_ipaccess = true;
+
+		bind->accept_ipaccess = priv.vc_mode == NS2_VC_MODE_BLOCKRESET;
 	}
 
 	/* create vcs */
@@ -909,7 +910,10 @@
 		/* validate settings */
 		switch (vtyvc->ll) {
 		case GPRS_NS2_LL_UDP:
-			dialect = NS2_DIALECT_IPACCESS;
+			if (priv.vc_mode == NS2_VC_MODE_BLOCKRESET)
+				dialect = NS2_DIALECT_IPACCESS;
+			else
+				dialect = NS2_DIALECT_STATIC_ALIVE;
 			if (strlen(vtyvc->remote.ip) == 0) {
 				/* Invalid IP for VC */
 				continue;