diff --git a/libs/freetdm/src/ftmod/ftmod_libpri/ftmod_libpri.c b/libs/freetdm/src/ftmod/ftmod_libpri/ftmod_libpri.c
index be301f3da8..aa071870a0 100644
--- a/libs/freetdm/src/ftmod/ftmod_libpri/ftmod_libpri.c
+++ b/libs/freetdm/src/ftmod/ftmod_libpri/ftmod_libpri.c
@@ -1251,6 +1251,8 @@ static ftdm_status_t state_advance(ftdm_channel_t *chan)
 					} else if (caller_data->hangup_cause == PRI_CAUSE_DESTINATION_OUT_OF_ORDER) {
 						/* Can happen when we have a DL link expire or some timer expired */
 						ftdm_set_state_locked(chan, FTDM_CHANNEL_STATE_HANGUP_COMPLETE);
+					} else if (caller_data->hangup_cause == PRI_CAUSE_INVALID_NUMBER_FORMAT) {
+						ftdm_set_state_locked(chan, FTDM_CHANNEL_STATE_HANGUP_COMPLETE);
 					}
 				}
 			}
diff --git a/libs/freetdm/src/ftmod/ftmod_zt/ftmod_zt.c b/libs/freetdm/src/ftmod/ftmod_zt/ftmod_zt.c
index 9c5ea6696f..369a05d1d0 100644
--- a/libs/freetdm/src/ftmod/ftmod_zt/ftmod_zt.c
+++ b/libs/freetdm/src/ftmod/ftmod_zt/ftmod_zt.c
@@ -1402,7 +1402,7 @@ static FIO_READ_FUNCTION(zt_read)
 			} else {
 				ftdm_log_chan_msg(ftdmchan, FTDM_LOG_DEBUG, "Skipping one IO read cycle due to DTMF event processing\n");
 			}
-			continue;
+			break;
 		}
 
 		/* Read error, keep going unless to many errors force us to abort ...*/