Ok cswroe,
Today, I connected the Polycom to the SLT port Ext 181.
I tried the suggested dialing 190 but all I got was a fast busy. Pressing the Passcode of 1111 just rang Ext. 111
I then from an extension phone dialed 181, took a bit but the Polycom rang and I answered by
pressing the phone button on the unit to answer the call.
Then on the extension phone the display showed CONF I pressed the button under it.
I then picked a CO line and dialed my home number and my wife answered.
Then on the extension phone the display showed ADD I pressed the button under it.
I then pressed the Speaker button and dialed another Extension phone.
That phone rang and I answered it.
Then the first extension phone showed ADD and I pressed the button under it.
Then on first extension phone the display showed BEGIN I pressed the button under it.
Then all parties were connected in a Conference Call.
It took a while to run through the steps to get it to work. A wrong key press and had to start over.
So I think the above will work. Do you see a flaw in the process??
As always I hope the above will help others faced with a similar challenge.
Let me know your thoughts. Also would like to know your thoughts on the DTMF question.
Thanks for the assist.
Les