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Duplicate DTMF events

I have a problem with a FXS port in a 3640 that is connected to an FXO port on a Panasonic PBX with Loop Start signaling. It is receiving duplicate DTMF events. I have tried various settings on the "timing digit" for that port at the following different settings: 50 ms, 100 ms, 250 ms, 500 ms.

However, I am still seeing the duplicate events.

The problem does NOT occur when a phone number is being dialed, but DOES occur mid-stream in a call.

Here is a sample duplicate of a user dialing 1-9,0 on the keypad. Voice Port Module signaling is enabled:

Feb 21 13:30:39.865 EST: htsp_digit_ready(3/0/0): digit = 1

Feb 21 13:30:39.945 EST: htsp_digit_ready(3/0/0): digit = 1

Feb 21 13:30:40.205 EST: htsp_digit_ready(3/0/0): digit = 2

Feb 21 13:30:40.285 EST: htsp_digit_ready(3/0/0): digit = 2

Feb 21 13:30:40.665 EST: htsp_digit_ready(3/0/0): digit = 3

Feb 21 13:30:41.161 EST: htsp_digit_ready(3/0/0): digit = 4

Feb 21 13:30:41.565 EST: htsp_digit_ready(3/0/0): digit = 5

Feb 21 13:30:41.925 EST: htsp_digit_ready(3/0/0): digit = 6

Feb 21 13:30:42.001 EST: htsp_digit_ready(3/0/0): digit = 6

Feb 21 13:30:42.425 EST: htsp_digit_ready(3/0/0): digit = 7

Feb 21 13:30:42.825 EST: htsp_digit_ready(3/0/0): digit = 8

Feb 21 13:30:43.241 EST: htsp_digit_ready(3/0/0): digit = 9

Feb 21 13:30:43.625 EST: htsp_digit_ready(3/0/0): digit = 0

The repeats happen randomly.

Here are the voice-port settings:

Foreign Exchange Station 3/0/0 Slot is 3, Sub-unit is 0, Port is 0

Type of VoicePort is FXS

Operation State is DORMANT

Administrative State is UP

The Last Interface Down Failure Cause is Administrative Shutdown

Description is not set

Noise Regeneration is enabled

Non Linear Processing is enabled

Non Linear Mute is disabled

Non Linear Threshold is -21 dB

Music On Hold Threshold is Set to -38 dBm

In Gain is Set to 0 dB

Out Attenuation is Set to 3 dB

Echo Cancellation is enabled

Echo Cancellation NLP mute is disabled

Echo Cancellation NLP threshold is -21 dB

Echo Cancel Coverage is set to 8 ms

Echo Cancel worst case ERL is set to 6 dB

Playout-delay Mode is set to adaptive

Playout-delay Nominal is set to 60 ms

Playout-delay Maximum is set to 250 ms

Playout-delay Minimum mode is set to default, value 40 ms

Playout-delay Fax is set to 300 ms

Connection Mode is normal

Connection Number is not set

Initial Time Out is set to 10 s

Interdigit Time Out is set to 10 s

Call Disconnect Time Out is set to 60 s

Supervisory Disconnect Time Out is set to 750 ms

Ringing Time Out is set to 180 s

Wait Release Time Out is set to 30 s

Companding Type is u-law

Region Tone is set for US

Analog Info Follows:

Currently processing none

Maintenance Mode Set to None (not in mtc mode)

Number of signaling protocol errors are 0

Impedance is set to 600r Ohm

Station name None, Station number None

Translation profile (Incoming):

Translation profile (Outgoing):

Voice card specific Info Follows:

Signal Type is loopStart

Ring Frequency is 25 Hz

Hook Status is On Hook

Ring Active Status is inactive

Ring Ground Status is inactive

Tip Ground Status is inactive

Digit Duration Timing is set to 250 ms

InterDigit Duration Timing is set to 100 ms

Hookflash-in Timing is set to max=1000 ms, min=150 ms

Hookflash-out Timing is set to 400 ms

No disconnect acknowledge

Ring Cadence is defined by CPTone Selection

Ring Cadence are [20 40] * 100 msec

Ringer Equivalence Number is set to 1

A diagram is:


Any recommendations?


Re: Duplicate DTMF events

This happens because of the difference in inter-digit timers in the PBX and router.

Try changing the inter-digit timers.

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