DNS entry for VoIP server

Scenario:

15 users, each of which has a PC and a VoIP phone.  

No Windows servers as each person pretty much works independently, with only simple file sharing on a NAS device.

All PCs use DHCP provided by the firewall, with the firewall being the default gateway and the ISPs DNS being used for DNS.

We are migrating phones to an internal VoIP server with 2 NICs.  One gets an IP address on the LAN and the other is on the public WAN.

I would like to have the address "voip.mycompany.com" internally resolve to the LAN ip address of the VoIP server.  To do that i have installed BIND on my VoIP server (freepbx) and added a master record for the mycompany.com domain and an A record for voip.mycompany.com.

I would assume that i need to change the DNS settings of the firewall, or those included with DHCP, or both to point to the internal DNS server.  I would like anything else to go out the public ISP servers to resolve.

IS there anything else i am missing?

Thanks
GL
gdinunzioAsked:
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kevinhsiehCommented:
Your DHCP server would need to hand out the IP address of the VoIP server as the DNS server. If you are going to do a split DNS where mycompany.com exists internally and on the public Internet, you need to duplicate all of the public records onto your internal DNS server. Otherwise, you won't be able to resolve things such as mycompany.com, www.mycompany.com, mail.mycompany.com, etc. If this works for you, a better solution would be to make your internal zone mycompany.local, and create an A record for voip.mycompany.local. If you do this, all of your records for mycompany.com will work without andy issues, and you can still get DNS resolution for internal mycompany.local resources.
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gdinunzioAuthor Commented:
That is what i thought.

I will be doing the former, replicating the external domain A records internally, as there are only a few.

Thanks again
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