diff --git a/libs/freetdm/mod_openzap/mod_openzap.c b/libs/freetdm/mod_openzap/mod_openzap.c
index a13a3026e5..9f190eef52 100644
--- a/libs/freetdm/mod_openzap/mod_openzap.c
+++ b/libs/freetdm/mod_openzap/mod_openzap.c
@@ -664,7 +664,9 @@ static switch_status_t channel_write_frame(switch_core_session_t *session, switc
 	private_t *tech_pvt = NULL;
 	zap_size_t len;
 	unsigned char data[SWITCH_RECOMMENDED_BUFFER_SIZE] = {0};
-	
+	zap_wait_flag_t wflags = ZAP_WRITE;
+	zap_status_t status;
+
 	channel = switch_core_session_get_channel(session);
 	assert(channel != NULL);
 
@@ -695,6 +697,13 @@ static switch_status_t channel_write_frame(switch_core_session_t *session, switc
 	}
 
 
+	wflags = ZAP_WRITE;	
+	status = zap_channel_wait(tech_pvt->zchan, &wflags, tech_pvt->zchan->effective_interval * 4);
+	
+	if (!(wflags & ZAP_WRITE)) {
+		goto fail;
+	}
+
 	len = frame->datalen;
 	if (zap_channel_write(tech_pvt->zchan, frame->data, frame->buflen, &len) != ZAP_SUCCESS) {
 		if (++tech_pvt->wr_error > 10) {
diff --git a/libs/freetdm/patches/droptest.diff b/libs/freetdm/patches/droptest.diff
deleted file mode 100644
index 5f73a2d42e..0000000000
--- a/libs/freetdm/patches/droptest.diff
+++ /dev/null
@@ -1,51 +0,0 @@
-Index: src/ozmod/ozmod_wanpipe/ozmod_wanpipe.c
-===================================================================
---- src/ozmod/ozmod_wanpipe/ozmod_wanpipe.c	(revision 776)
-+++ src/ozmod/ozmod_wanpipe/ozmod_wanpipe.c	(working copy)
-@@ -604,6 +604,8 @@
- 		return ZAP_SUCCESS;
- 	}
- 
-+	zap_log(ZAP_LOG_ERROR, "FAIL %d\n", bsent);
-+
- 	return ZAP_FAIL;
- }
- 
-Index: mod_openzap/mod_openzap.c
-===================================================================
---- mod_openzap/mod_openzap.c	(revision 776)
-+++ mod_openzap/mod_openzap.c	(working copy)
-@@ -674,6 +674,7 @@
- 	assert(tech_pvt->zchan != NULL);
- 
- 	if (switch_test_flag(tech_pvt, TFLAG_DEAD)) {
-+		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "DEAD\n");
- 		return SWITCH_STATUS_FALSE;
- 	}
- 
-@@ -682,6 +683,7 @@
- 	}
- 
- 	if (!switch_test_flag(tech_pvt, TFLAG_IO)) {
-+		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "NO FLAG IO\n");
- 		goto fail;
- 	}
- 	
-@@ -689,6 +691,7 @@
- 		frame->data = data;
- 		frame->buflen = sizeof(data);
- 		if ((frame->datalen = tech_pvt->write_codec.implementation->encoded_bytes_per_packet) > frame->buflen) {
-+			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "BUF ERR\n");
- 			goto fail;
- 		}
- 		memset(data, 255, frame->datalen);
-@@ -697,7 +700,9 @@
- 
- 	len = frame->datalen;
- 	if (zap_channel_write(tech_pvt->zchan, frame->data, frame->buflen, &len) != ZAP_SUCCESS) {
-+		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "WR ERR\n");
- 		if (++tech_pvt->wr_error > 10) {
-+			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "10 WR ERR\n");
- 			goto fail;
- 		}
- 	} else {
diff --git a/libs/freetdm/patches/droptest2.diff b/libs/freetdm/patches/droptest2.diff
deleted file mode 100644
index 9af97b75d0..0000000000
--- a/libs/freetdm/patches/droptest2.diff
+++ /dev/null
@@ -1,29 +0,0 @@
-Index: mod_openzap/mod_openzap.c
-===================================================================
---- mod_openzap/mod_openzap.c	(revision 778)
-+++ mod_openzap/mod_openzap.c	(working copy)
-@@ -664,7 +664,9 @@
- 	private_t *tech_pvt = NULL;
- 	zap_size_t len;
- 	unsigned char data[SWITCH_RECOMMENDED_BUFFER_SIZE] = {0};
--	
-+	zap_wait_flag_t wflags = ZAP_WRITE;
-+	zap_status_t status;
-+
- 	channel = switch_core_session_get_channel(session);
- 	assert(channel != NULL);
- 
-@@ -695,6 +697,13 @@
- 	}
- 
- 
-+	wflags = ZAP_WRITE;	
-+	status = zap_channel_wait(tech_pvt->zchan, &wflags, tech_pvt->zchan->effective_interval * 4);
-+	
-+	if (!(wflags & ZAP_WRITE)) {
-+		goto fail;
-+	}
-+
- 	len = frame->datalen;
- 	if (zap_channel_write(tech_pvt->zchan, frame->data, frame->buflen, &len) != ZAP_SUCCESS) {
- 		if (++tech_pvt->wr_error > 10) {