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While in a conference call on a Snom desk phone, it's possible to control the call using the phone's handset or, if in use, an headset connected to the phone
This can mainly be done using two parameters, as below
Disconnect on Hook
There is a parameter, called conf_hangup in the configuration file or "Disconnect on Hook" in the web interface
This is set to "off" by default, and it doesn't disconnect the call during a conference if the handset is placed back on hook, or if user tries to close the call using the headset's button
It can be useful if you want to avoid the conference closing when you place the handset back on-hook, if you want to switch to the speakerphone
To be able to close the conference call by placing the handset on-hook, or by pressing the headset's button, you need to enable this parameter
Cancel Conference
There also is a parameter called cancel_conference in the configuration file, that cannot be set via web interface (if not by using the right click)
If this setting is enabled, and it is by default, putting the handset on-hook or using the headset's button will close the conference call
If it's disabled, with the same actions, all the parties in the conference will be put on hold
Conclusion
To be able to close a call by putting the handset back on-hook or by using the headset's button, both conf_hangup and cancel_conference must be enabled
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