Here are the Colours and Pinouts to enable you to use the Silver ITG Card Adapter
Nortel Item code A0852632 for use with a Call Pilot 201i system.
The RJ45 outlet for the TLAN is OK for use with the CLAN on the Call Pilot!.
The proper ELAN pinouts are shown below.

With the clip on the RJ45 plug away from you.

RJ45       Viking 25pr connector
ELAN          Pin number
Plug       

Pin-1 ---- Orange / Purple = Pin 44 

Pin-2 ---- Purple / Orange = Pin 43

Pin-3 ---- Blue / Purple = Pin 42

Pin-6 ---- Purple / Blue = Pin 41 

TLAN / CLAN
Plug

Pin-1 ---- Brown / Purple = Pin 48

Pin-2 ---- Purple / Brown = Pin 47

Pin-3 ---- Green / Purple = Pin 46

Pin-6 ---- Purple / Green = Pin 45