ZAP Channel DID's for Outgoing Calls

Hi,
Is it possible to use ZAP Channel DID feature for outbound calls?
I have One company Using Asterisk with Zaptel+FreePBX another on second floor using legacy PBX system I am planning to connect 2 extensions from legacy pbx to zaptel so ground floor can still stay in-touch with 1st floor after being replaced by Asterisk as it's main PABX.
I have 4 Port Zaptel with to PSTN lines connected
the only problem is that when someone try to contact 1st floor it uses the PSTN line where i wan't it to use Channel which has extension from old pbx channel 3 and 4.
your help will be appreciated.
Regards,
Best
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Could you explain your setup
Could you explain your setup a little better. I am not sure I understand how you have these two pbx's arrange. Could you tell how you have upstairs connected to downstairs.
John Mullinix, Cohutta.Com, Inc.
1-706-632-3343 -- sip://17066323343@qth.cohutta.org
Looking for Dundi peers in Baltimore, MD and Lake Wales, FL USA
ok
1st Asterisk PBX with 4 PORT zap analog.
Ground floor old legacy PABX Panasonic.
I wan't to be able to dial to all extensions which are connected with panasonic.
i have two ports free on my zap card.
Regards,
Best