PBX clock is not synchronizing with DC

I have on VLAN 3 (10.10.110/24) a PBX and VLAN 4 (10.0.112.0/24) IP phones.  routing between VLAN 1 and VLAN 2 is working.
On VLAN 1 (192.168.110.0/24) I have computers, W2008 DC, W2008 database.
I can ping from VLAN 1 the PBX on VLAN 3
I have setup the DC IP address as NTP server on the PBX. but I m seeing the status disconnected. That's probably mean from VLAN 3 I can"t reach the DC located on the VLAN 1

I am trying to find out how I can fix this to be able to synchronize the PBX and IP phones clock with the DC.

Any idea?
celmajjAsked:
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masnrockCommented:
I can ping from VLAN 1 the PBX on VLAN 3
But can you ping the other way around?

I am trying to find out how I can fix this to be able to synchronize the PBX and IP phones clock with the DC.
You just need to have rules to specify to allow traffic from VLAN 3 to VLAN 1. What type of equipment do you have?
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MaheshArchitectCommented:
you need UDP 123 from NTP client (PBX) to NTP server, make sure VLAN3 can reach to DC IP over all well known AD port group which should include UDP 123 as well
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