diff --git a/libs/openzap/conf/tones.conf b/libs/openzap/conf/tones.conf
index e24ccccfcd..d0f27acd93 100644
--- a/libs/openzap/conf/tones.conf
+++ b/libs/openzap/conf/tones.conf
@@ -1,14 +1,14 @@
 [us]
-generate-dial => %(1000,0,350,440)
+generate-dial => v=-7;%(1000,0,350,440)
 detect-dial => 350,440
 
-generate-ring => %(2000,4000,440,480)
+generate-ring => v=-7;%(2000,4000,440,480)
 detect-ring => 440,480
 
-generate-busy => %(500,500,480,620)
+generate-busy => v=-7;%(500,500,480,620)
 detect-busy => 480,620
 
-generate-attn => %(100,100,1400,2060,2450,2600)
+generate-attn => v=0;%(100,100,1400,2060,2450,2600)
 detect-attn => 1400,2060,2450,2600
 
 detect-fail1 => 913.8
diff --git a/libs/openzap/general.makefile b/libs/openzap/general.makefile
index 5b2fcb9821..b6d3777436 100644
--- a/libs/openzap/general.makefile
+++ b/libs/openzap/general.makefile
@@ -1,3 +1,3 @@
 CC=gcc 
-CC_CFLAGS += -Wall -Werror -Wextra -std=c99 -pedantic -Wno-unused-parameter 
+CC_CFLAGS += -Wall -Werror -Wextra -std=c99 -pedantic -Wno-unused-parameter
 
diff --git a/libs/openzap/src/include/libteletone_generate.h b/libs/openzap/src/include/libteletone_generate.h
index 5340f767cc..177c893966 100644
--- a/libs/openzap/src/include/libteletone_generate.h
+++ b/libs/openzap/src/include/libteletone_generate.h
@@ -112,12 +112,12 @@ extern float powf (float, float);
 
 #define TELETONE_VOL_DB_MAX 0
 #define TELETONE_VOL_DB_MIN -63
+#define MAX_PHASE_TONES 4
 
 struct teletone_dds_state {
-	uint32_t phase_rate;
+	uint32_t phase_rate[MAX_PHASE_TONES];
 	uint32_t scale_factor;
 	uint32_t phase_accumulator;
-	int16_t sample;
 	teletone_process_t tx_level;
 };
 typedef struct teletone_dds_state teletone_dds_state_t;
@@ -131,11 +131,20 @@ typedef struct teletone_dds_state teletone_dds_state_t;
 
 extern int16_t TELETONE_SINES[SINE_TABLE_MAX];
 
-static __inline__ int16_t teletone_dds_modulate_sample(teletone_dds_state_t *dds)
+static __inline__ int32_t teletone_dds_phase_rate(teletone_process_t tone, uint32_t rate)
+{
+	return (int32_t) ((tone * MAX_PHASE_ACCUMULATOR) / rate);
+}
+
+static __inline__ int16_t teletone_dds_state_modulate_sample(teletone_dds_state_t *dds, uint32_t pindex)
 {
     int32_t bitmask = dds->phase_accumulator, sine_index = (bitmask >>= 23) & SINE_TABLE_LEN;
 	int16_t sample;
 
+	if (pindex >= MAX_PHASE_TONES)  {
+		pindex = 0;
+	}
+
     if (bitmask & SINE_TABLE_MAX) {
         sine_index = SINE_TABLE_LEN - sine_index;
 	}
@@ -146,7 +155,7 @@ static __inline__ int16_t teletone_dds_modulate_sample(teletone_dds_state_t *dds
 		sample *= -1;
 	}
 
-	dds->phase_accumulator += dds->phase_rate;
+	dds->phase_accumulator += dds->phase_rate[pindex];
 
     return (int16_t) (sample * dds->scale_factor >> 15);
 }
@@ -154,19 +163,22 @@ static __inline__ int16_t teletone_dds_modulate_sample(teletone_dds_state_t *dds
 static __inline__ void teletone_dds_state_set_tx_level(teletone_dds_state_t *dds, float tx_level)
 {
 	dds->scale_factor = (int) (powf(10.0f, (tx_level - DBM0_MAX_POWER) / 20.0f) * (32767.0f * 1.414214f));
+	dds->tx_level = tx_level;
 }
 
-static __inline__ void teletone_dds_state_set_tone(teletone_dds_state_t *dds, teletone_process_t tone, uint32_t rate, float tx_level)
+static __inline__ void teletone_dds_state_reset_accum(teletone_dds_state_t *dds)
 {
 	dds->phase_accumulator = 0;
-	dds->phase_rate = (int32_t) ((tone * MAX_PHASE_ACCUMULATOR) / rate);
-	
+}
 
-	if (dds->tx_level != tx_level || !dds->scale_factor) {
-		teletone_dds_state_set_tx_level(dds, tx_level);
+static __inline__ int teletone_dds_state_set_tone(teletone_dds_state_t *dds, teletone_process_t tone, uint32_t rate, uint32_t pindex)
+{
+	if (pindex < MAX_PHASE_TONES)  {
+		dds->phase_rate[pindex] = teletone_dds_phase_rate(tone, rate);
+		return 0;
 	}
 	
-	dds->tx_level = tx_level;
+	return -1;
 }
 
 
diff --git a/libs/openzap/src/libteletone_generate.c b/libs/openzap/src/libteletone_generate.c
index bb904b2d68..2804f0a920 100644
--- a/libs/openzap/src/libteletone_generate.c
+++ b/libs/openzap/src/libteletone_generate.c
@@ -219,7 +219,8 @@ int teletone_mux_tones(teletone_generation_session_t *ts, teletone_tone_map_t *m
 
 	if (map->freqs[0] > 0) {
 		for (freqlen = 0; map->freqs[freqlen] && freqlen < TELETONE_MAX_TONES; freqlen++) {
-			teletone_dds_state_set_tone(&tones[freqlen], map->freqs[freqlen], ts->rate, vol);
+			teletone_dds_state_set_tone(&tones[freqlen], map->freqs[freqlen], ts->rate, 0);
+			teletone_dds_state_set_tx_level(&tones[freqlen], vol);
 		}
 	
 		if (ts->channels > 1) {
@@ -249,7 +250,7 @@ int teletone_mux_tones(teletone_generation_session_t *ts, teletone_tone_map_t *m
 			sample = 128;
 
 			for (i = 0; i < freqlen; i++) {
-				int32_t s = teletone_dds_modulate_sample(&tones[i]);
+				int32_t s = teletone_dds_state_modulate_sample(&tones[i], 0);
 				sample += s;
 			}
 			sample /= freqlen;