What you're looking for is in Appendix B of the Octel 350 Service Manual which you can download from support.avaya.com . All of the line types for all cards are listed. I think you may be looking for Line Type 43.
Below is Page 1 from App. B:
The following line types are supported by the Octel 350 message server at Aria 1.2 and
Aria 2.0:
1 – In-band plain-old-telephone service (POTS), analog TIC (ATIC), loop start, dial-tone and fast-busy disconnects
2 – In-band POTS, analog TIC (ATIC), loop start, fast-busy disconnect
3 – In-band POTS, analog TIC (ATIC), loop start, dial-tone disconnect
4 – Generic POTS, analog TIC (ATIC), loop start, dial-tone and fast-busy disconnect
5 – Generic POTS, analog TIC (ATIC), loop start, fast-busy disconnect
6 – Generic POTS, analog TIC (ATIC), loop start, dial-tone disconnect
29 – POTS, analog TIC (ATIC), loop start TIC, Rolm station line
35 – POTS, analog TIC (ATIC), Centrex 1AESS integration, loop start
37 – POTS, Australian Central Office
38 – NEC 1200, Australian
39 – NEC 2400 integration
40 – WooBox, POTS, analog TIC (ATIC), loop start, dial-tone and fast-busy disconnects, no Autovon
41 – WooBox, POTS, analog TIC (ATIC), loop start, dial-tone and fast-busy disconnects, message waiting, no Autovon
42 – POTS, analog TIC (ATIC), Rolm PID, loop start
43 – Modified direct inward dial (DID), dual-tone multifrequency (DTMF), ground start
44 – In-band, ground start, dial-tone and fast-busy disconnects