FreeSWITCH

Duplicate inband and outband DTMF from Skype

Details

  • Type: Bug Bug
  • Status: Closed Closed
  • Priority: Major Major
  • Resolution: Fixed
  • Affects Version/s: None
  • Fix Version/s: None
  • Component/s: mod_skypopen
  • Labels:
    None
  • Environment:
    Windows
  • Platform:
    Win32/VS
  • Uname:
    NA
  • CPU Info:
    NA
  • FreeSWITCH GIT Revision:
    12833
  • Reproduced with GIT HEAD?:
    Yes

Description

Hi,

When a call is bridged from a Skype client to a SIP client and a DTMF is sent from Skype then two duplicate DTMFs are received on SIP side - one inband DTMF and one outband RFC 2833 DTMF.

This confuses the application on the SIP side.

As a test patch, I disabled the code in dtmf_received() in mod_skypiax.c and got only a single inband DTMF as desired.

Perhaps a skypiax or dialplan configuration value should be added whether or not to forward Skype DTMF.
FS IVR applications should receive these DTMFs, and bridged calls should not receive them because they're already inband.

Thanks.

Activity

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Giovanni Maruzzelli added a comment -
Hi,
I've not seen this before.

How is the flow of the call?

eg:
skypeclient -> skypiax->FS->sofia->remote_app
or
sipphone->sofia->FS->skypiax->skypeclient->skypeout->remote_app
Show
Giovanni Maruzzelli added a comment - Hi, I've not seen this before. How is the flow of the call? eg: skypeclient -> skypiax->FS->sofia->remote_app or sipphone->sofia->FS->skypiax->skypeclient->skypeout->remote_app
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Ron Avriel added a comment -
The flow is skypeclient -> skypiax->FS->sofia->remote_app.

The point is that as far as I could see using a sniffer, when a DTMF is sent from a Skype client then it sent inband and in addition a skype DTMF is received at FS that causes a RFC 2833 DTMF to be sent.
Show
Ron Avriel added a comment - The flow is skypeclient -> skypiax->FS->sofia->remote_app. The point is that as far as I could see using a sniffer, when a DTMF is sent from a Skype client then it sent inband and in addition a skype DTMF is received at FS that causes a RFC 2833 DTMF to be sent.
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Ron Avriel added a comment -
Hi,

Any news about this issue? Can you reproduce the problem? Do you need any further information?

Thanks.
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Ron Avriel added a comment - Hi, Any news about this issue? Can you reproduce the problem? Do you need any further information? Thanks.
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Permalink
Giovanni Maruzzelli added a comment -
fixed in svn 13664

skypiax: the Skype client sends us BOTH inband and out_of_band DTMFs, no way to shut the inbands. Let's intercept the out_of_bands ONLY if we are not bridged (eg: IVR, so not to waste CPU in detecting inband), but not propagate the out_of_band DTMFs if we are bridged (inband ones will be propagated)
Show
Giovanni Maruzzelli added a comment - fixed in svn 13664 skypiax: the Skype client sends us BOTH inband and out_of_band DTMFs, no way to shut the inbands. Let's intercept the out_of_bands ONLY if we are not bridged (eg: IVR, so not to waste CPU in detecting inband), but not propagate the out_of_band DTMFs if we are bridged (inband ones will be propagated)

People

  • Assignee:
    Giovanni Maruzzelli
    Reporter:
    Ron Avriel
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Dates

  • Created:
    Updated:
    Resolved: