DTMF is not working on conference call

when I use conference and then join a 1-800 number with IVR system to the same conference, Dial tone is not working. it seems dial pad functionality is not sending command out and it just select different options on conference call.

Any idea? Thanks, in Advance.

let me clarify that I am referring to conference call from soft key - not meet me or confbridge. and I’m using following:
Phone: Cisco 7975
Firmware: SCCP75.9-3-1SR$-1S
Extension: SIP (and SCCP - both)
Asterisk version: 11.4.0

Any idea guys ?
I see dtmfmode=inband or outband on sccp.conf , I have tried both but still not working.

let me know if I can provide more info.

hi try
dtmfmode=auto

incrediblepbx*CLI> sccp show device SEPxxxxxxxxxxxxxxx

— SCCP channel driver device settings ----------------------------------------------------------------------------------
MAC-Address : SEPxxxxxxxxxxxxx
Protocol Version : Supported ‘16’, In Use '16’
Protocol In Use : SCCP Version 16
Tokenstate : no token requested
Keepalive : 60
Registration state : OK(5)
State : On Hook(0)
MWI light : Lamp On(2)
MWI handset light : off
Description : Adrians 7921G
Config Phone Type : 7940
Skinny Phone Type : Cisco 7921(365)
Softkey support : yes
Softkeyset :
BTemplate support : yes
linesRegistered : yes
Image Version :
Timezone Offset : 0
Capabilities : (ulaw/64k, alaw/64k, rfc2833, g729, g729a, g729b, g729ab, slin16, g722/64k, g722/56k, g722/48k, g729b/ilbc, g729b/ilbc)
Codecs preference : (alaw/64k, alaw/56k, ulaw/64k, ulaw/56k, g729, g729a, g729b, g729ab, g729/annex/b, g729a, g729b, g729ab, g729/annex/b, g729a, g729b, g729ab, g729/annex/b, g729a)
Audio TOS : 0
Audio COS : 0
Video TOS : 0
Video COS : 0
DND Feature enabled : yes
DND Status : Disabled
Can Transfer : on
Can Park : on
Can CFWDALL : on
Can CFWBUSY : off
Can CFWNOANSWER : off
Allow ringin notifica : no
Private softkey : on
Dtmf mode : In-Band
digit timeout : 8
Nat : off
Videosupport? : no
Direct RTP : off
Trust phone ip (depre : off
Bind Address : 172.16.32.197:1857
Server Address : 172.16.32.128
Deny/Permit : deny:0.0.0.0/0.0.0.0,permit:172.16.32.197/255.255.255.255,
Early RTP : Yes (Progress)
Device State (Acc.) : None
Last Used Accessory : None
Last dialed number : 100
Default line instance : 1
Custom Background Ima : —
Custom Ring Tone : —
PendingUpdate : off
PendingDelete : off
Directed Pickup : on
Pickup Context : from-internal (exists)
Pickup Mode Answer : on

±-- Buttons ------------------------------------------------------------------------------+
| Id TypeStr Type pendUpdt pendDel Default |

  • ==== ============================== ======================== ======== ======== ========= +
    | 1 Speeddial 1 No No No |
    | 0 Line 0 No No No |
    | 0 Line 0 No No No |
    | 1 Line 0 No No Yes |
    | 2 Speeddial 1 No No No |
    ±-----------------------------------------------------------------------------------------+

±-- Lines --------------------------------------------------------------------------------+
| Id Name Suffix Label CfwdType CfwdNumber |

  • ==== ======================= ====== ======================== ========== ================ +
    | 1 98012 Phone 1 Line 2 None |
    ±-----------------------------------------------------------------------------------------+

±-- Speeddials ---------------------------------------------------------------------------+
| Id Name Number Hint |

  • ==== ======================= =============================== =========================== +
    | 1 Helpdesk 98112 98112@hints |
    | 2 Phone 2 Line 1 98021 98021@hints |
    ±-----------------------------------------------------------------------------------------+

±-- Features -----------------------------------------------------------------------------+
| Id Name Options Status |

  • ==== ======================= =============================== =========================== +
    ±-----------------------------------------------------------------------------------------+

±-- ServiceURLs --------------------------------------------------------------------------+
| Id Name URL |

  • ==== ======================= =========================================================== +
    ±-----------------------------------------------------------------------------------------+

±-- Variables ----------------------------------------------------------------------------+
| Name Value |

  • ============================ =========================================================== +
    | testvar value |
    ±-----------------------------------------------------------------------------------------+

±-- CallStatistics ---------------------------------------------------------------------------------------------------+
| Type Calls PcktSnd PcktRcvd Lost Jitter Latency Quality avgQual meanQual maxQual rConceal sConceal |

  • ======== ======== ======== ======== ======== ======== ======== ======== ======== ======== ======== ======== ======== +
    | LAST 2 274 329 3 1 82 0.000000 0.000000 0.000000 0.000000 0.000000 0 |
    | AVG 2 288 349 2 5 91 0.000000 0.000000 0.000000 0.000000 0.000000 0 |
    ±---------------------------------------------------------------------------------------------------------------------+
    incrediblepbx*CLI>