Let me try to explain to you again...
A
DN is the Ext # of the phone, it is not hardware!!
A
port is what you connect the cable with jack too.
A jack is what you plug your phone into
"On another port
(dn) same problem"
You mean "on another port same thing"
"phone works on an existing dn"
This makes no sense, I dont even know what you mean by this.
How about this....stop worrying about the DN #, if the phone works elsewhere in your office then call in a tech to troubleshoot the port and jack.
If same the problem follows the phone no matter where you plug it into then replace the phone or do as I said above.
Best you call in a tech if still an issue.
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