My phone calls disconnect after approx. 1 minute.

There is a bug with your VoIP providers gateway.  To work around this issue select External Lines from the Axon Web Control panel, and then click the name of the External Line being used for the phone call.  On the display for that line, click the button.  On the Advanced Settings page, scroll down to Sip Compatibility Options and tick the check box for “Disable call activity polling”.

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