Cortelco network adaptor - Manual (Page 15)

Level Switch Settings Table
The Data Port Anywhere Level switch adjusts the transmit level of your
modem to the telephone set. The Level switch is manually set in one
of four settings and is dependent on the telephone set you’re using.
Level 3 - Approximately 75% of the electronic or digital PBX telephone
systems you will encounter use Setting 3.
Telephone Telephone Switch Notes
Manufacturer Set Model Setting
Ameritech
None Specified 1 1a
AT&T (See Listings for Avaya)
Avaya Definity 3 ---
Destiny 3 2
Dimension 2 or 3 2
Horizon 2 ---
ISDN 3 1a
Avaya ISDN 7500 series 3 ---
ISDN 8500 series 3 ---
Infinity 3 ---
Merlin 3 ---
Merlin II 3 2
Merlin Legend 3 7
Partner 3 ---
Spirit 3 8
System 25 3 3 & 4
System 75 3 3 & 4
System 85 3 3 & 4
Comdial Digitech 3 ---
Executech 3 ---
Executive --- 2
Executive II --- 2
Impact 3 ---
InnTouch 3 8
David Systems None Specified 3 2
Eagle None Specified 2 ---
Ericsson MD-110 3 1a
Executone Encore CX 3 7
IDS 3 7
Key Systems 2 or 3 ---