[cisco-voip] UCM7 won't ACK DHCP Request for remote site phones

[Mark Holloway]

UCM 7.1.3 is configured as DHCP server providing addresses for multiple subnets both locally and at remote branch offices.  7965 phones on same site as UCM acquire DHCP on the voice vlan just fine and register with UCM.  Phones at remote sites are not acquiring DHCP.  I ran a tshark packet capture on UCM VLAN and I see the DHCP requests from the phones at the branch sites arriving at the UCM site as expected.  Remote phones are sending DHCP Discover and DHCP Request but its as if UCM ignores the DHCP Request.  I can take the phone from one of the remote sites and physically plug into the voice vlan at the same site as UCM and it works fine. 

Has anyone seen this behavior? 

Regards,
Mark