802.1x phone with two MAC address

Hello,
I have following scenario: Computers are connected behind phones, and phones are authenticating with MAB. The problem is with phones, because they have two mac addresses one is in voice vlan and another is in data vlan. Both phone and computer are authenticated successfully but when switch sees additional MAC address of phone in data vlan it shuts down port. Here is sample configuration:
interface FastEthernet0/1
switchport mode access
switchport access vlan 10
switchport voice vlan 15
authentication host-mode multi-domain
authentication port-control auto
dot1x pae authenticator
authentication violation shutdown
mab
spanning-tree portfast

Can you verify if the phone's mac address is being learned on the data vlan and the voice vlan? Because cisco phones use cdp to discover if a voice vlan is configured on the switchport before forwarding traffic.
Please issue a show mac address table interface x/y after bouncing the port to see what is causing the port to error disable.
Also what version of code is running on the switch and phone?
Thanks

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Hi,
The question is on the title:
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I hope a clearly asked my question (my frenchy english is sometimes clumsy).
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Welcome to Apple Discussions.
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• MySync from MildMannered Industries (technology acquired by Mark/Space)
• the not-yet released SyncTogether from Mark/Space
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http://www.mildmanneredindustries.com/mysync
http://www.markspace.com/synctogether.php

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802.1x phone with two MAC address

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