Grandstream 17 minutes hangup bug

To prevent the Grandstream ATA's (or phones) to hangup after exactly 17:28 minutes change the settings below:

Provisioning - Allow re-invites from this extension :  ON

Grandstream device:
UAC Specify refresher: UAS
UAS Specify refresher: UAS
Force INVITE: Yes

Login to the ATA through the LAN port.  
IP is
Default password: admin

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