1751-V with 12.4(9)T CME 4.0 Problems with 7920

Hi. I had a 1751-V running without problems with 7940,7960 and 7912 phones.. I configured a new 7920 in the system and when the 7920 register with the CME all the 7940 and 7960 IP Phones unregister from the router and they only came back if I turn off the 7920.The 7912 IP Phone is working fine. I don't know if it is something related to CME or to DHCP. THe router is also the DHCP server..
Attach debugs from the router and relevant configuration..
Any ideas?
Thanks in advanced,
-Jose

Upgrade phone firmware CMtern _7920.4.0-03-00

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