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Most likely your phone system does not have a route back to the internet. Did you give it a static route?
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Most likely your phone system does not have a route back to the internet. Did you give it a static route?

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It has the DNS server address.
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Right. I don't know how to add routes to this device, but does it have a valid route to the internet? A default gateway? Is the dns server on your network or on the internet? 
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Right. I don't know how to add routes to this device, but does it have a valid route to the internet? A default gateway? Is the dns server on your network or on the internet?

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The DNS server is on the network. 
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What type of configuration interface do you have? is there any place to set a default gateway or add routes?
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What type of configuration interface do you have? is there any place to set a default gateway or add routes?

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I have a Samsung iDCS phone system with Voice Mail that I can access via Telnet using the network port and the private IP I assigned it. I used a 1-to-1 NAT on my firewall and assigned it a public IP. Using this IP it will not connect. <br />
I tested the Telnet service through the firewall using another server with the same setup and was successful.<br />
Why can I not connect to my phone system this way?
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I have a Samsung iDCS phone system with Voice Mail that I can access via Telnet using the network port and the private IP I assigned it. I used a 1-to-1 NAT on my firewall and assigned it a public IP. Using this IP it will not connect. 
I tested the Telnet service through the firewall using another server with the same setup and was successful.
Why can I not connect to my phone system this way?

Telnet with public IP will not connect

Telnet is an application layer protocol used on the Internet or local area networks to provide a bidirectional interactive text-oriented communication facility using a virtual terminal connection. SSH was designed as a replacement for Telnet and for unsecured remote shell protocols. The term telnet is also used to refer to the software that implements the client part of the protocol. SSH provides a secure channel over an unsecured network in a client-server architecture, connecting an SSH client application with an SSH server.