DTMF not received at all from dongle (but sending works)

[Linus Kendall]

Hi,

I have set up Asterisk 11 using chan_dongle together with an E1752 dongle and everything except incoming DTMF seems to work fine. I have tested incoming/outgoing voice as well as incoming and outgoing calls, however no luck on incoming DTMF.

Enabled DTMF logging (dtmf => dtmf in logger.conf) and am not getting any messages at all when attempting to send DTMF from a phone dialing into the dongle. However, when making an outbound call via SIP through the dongle channel I can successfully send DTMF both to other SIP servers as well as via the cellular network. 

Current values in dongle.conf (have tested other combinations as well): 

mindtmfgap=45                   ; minimal interval from end of previews DTMF from begining of next in ms

mindtmfduration=10              ; minimal DTMF tone duration in ms

mindtmfinterval=20              ; minimal interval between ends of DTMF of same digits in ms

dtmf=inband                     ; control of incoming DTMF detection, possible values:

Is there some configuration setting that I might have missed?

kolmi*CLI> core show version

Asterisk 11.9.0~dfsg-2~bpo70+1 built by buildd @ brahms on a i686 running Linux on 2014-06-02 18:25:26 UTC

kolmi*CLI> dongle show version

chan_dongle: Huawei 3G Dongle Channel Driver, Version 1.1, Revision 34

Project Home: http://code.google.com/p/asterisk-chan-dongle

Bug Reporting: http://code.google.com/p/asterisk-chan-dongle/issues/list

kolmi*CLI> dongle show device state dongle0

-------------- Status -------------

  Device                  : dongle0

  State                   : Free

  Audio                   : /dev/ttyUSB1

  Data                    : /dev/ttyUSB2

  Voice                   : Yes

  SMS                     : Yes

  Manufacturer            : huawei

  Model                   : E1752

  Firmware                : 11.126.03.01.314

  IMEI                    : ---

  IMSI                    : ---

  GSM Registration Status : Registered, home network

  RSSI                    : 18, -77 dBm

  Mode                    : GSM/GPRS

  Submode                 : EDGE

  Provider Name           : Vodafone In

  Location area code      : 20020

  Cell ID                 : C5AB

  Subscriber Number       : Unknown

  SMS Service Center      : +919830099990

  Use UCS-2 encoding      : Yes

  USSD use 7 bit encoding : No

  USSD use UCS-2 decoding : Yes

  Tasks in queue          : 0

  Commands in queue       : 0

  Call Waiting            : Disabled

  Current device state    : start

  Desired device state    : start

  When change state       : now

  Calls/Channels          : 0

    Active                : 0

    Held                  : 0

    Dialing               : 0

    Alerting              : 0

    Incoming              : 0

    Waiting               : 0

    Releasing             : 0

    Initializing          : 0

[Chandraprakash Karande]

Hi Linus,
I have exactly the same configuration of Asterisk, Chan Dongle and E1752 Modem and facing exactly the same problem :) Additional, I am running Asterisk on Ubuntu 14.01 LT

Since you posted this message in July, have you been able to find a solution to this in the meanwhile. If so please let me know. It will help me a lot.

Regards,
CP

[Zhomart]

Any progress on this issue ?

I am also facing the same problem...

Playing with dtmf params in dongle.conf can partially solve the problem, by recognizing some keys some times.

[Zhomart]

Did you manage to resolve somehow this problem????

[Zhomart]

I just changed the sim card, switching to other mobile operator has surprised.

All incoming DTMF works perfect. Even If I making a call using previous opererator.

On Monday, July 7, 2014 5:02:31 PM UTC+6, Linus Kendall wrote:

[Chandraprakash Karande]

I checked with 2 different SIM cards but from the same operator. However one of these SIM cards used to work fine when used in a GSM-VOIP Gateway but they do not seems to work with chan_dongle. 

As per your solution i may need to try SIM from another operator. Will try and let you know.

[adrian.p...@gdctelecom.net]

Did you try option ?

dtmf=relax

[Chandraprakash Karande]

Yes but it still doesn't work. My configuration and issue is exactly same as in the original post made by Linus Kendall

[Ahmed El-Etriby]

Just change the operator, mine solved after testing another SIM from another carrier.

[tablet...@gmail.com]

I find dtmf receiving works on some mobile networks and not others. Maybe it's something to do with how they process and send dtmf packets.

[tablet...@gmail.com]

From experience, in the UK, I find the 3 network best for handling dtmf in this way. Bonus, their 321 tarrif with no credit expiry gives you a trunk that's very cheap to run.

[rsam...@gmail.com]

hello, i have same issue as you have or haved, did you make it work?}
regards

[sdfsdfsdf]

Hello guys,

I had the same problem which was fixed by changing the following settings in dongle.conf:

dtmf=inband             
mindtmfduration=40

[rmikh...@griddynamics.com]

Thank you, this just worked out for me without any sim change with Russian beeline operator

[Mostafa Hassan]

thanx