The OS7000 doesn't support the feature vlan mobile-tag. You don't necessarily need to tag traffic on a port to do voice. In case you are not using dot1x or other authentication methods on the port you can still have a dot1q tag for voice and no tag for data traffic (e.g. for the PC connected behind the phone).
Please elaborate on the scenario and I'll able to help better than that.
Please note that at no time I will provide you with AOS releases. Kindly contact your Business Partner or Alcatel-Lucent for that.
Official Alcatel-Lucent OmniSwitch documentation available at:Alcatel-Lucent Resource Library