diff -u ./q931.c ../libpri-1.2.2-orig/libpri-1.2.2/q931.c
--- ./q931.c    2006-03-29 21:16:45.000000000 -0500
+++ ../libpri-1.2.2-orig/libpri-1.2.2/q931.c    2006-01-17 08:43:18.000000000 -0500
@@ -1057,7 +1057,7 @@
 static FUNC_SEND(transmit_display)
 {
        int i;
-       if ((pri->switchtype != PRI_SWITCH_QSIG)
+       if ((pri->switchtype != PRI_SWITCH_NI1) && (pri->switchtype != PRI_SWITCH_QSIG)
                        && *call->callername) {
                i = 0;
                if(pri->switchtype != PRI_SWITCH_EUROISDN_E1) {