There are 2 COS's - Classes of Service (NOT LCOSV) below which work for me.
First is allow internal forwarding.
Second is allow internal AND external forwarding.
No CO is added to the system just TIE.
So to change a phone to Internal forwarding only - CHA-S(B)CSU:STNO=XXXX,COS1=12;
+------+-----------------+---------------+-----------------+
| COS | VOICE | FAX | DTE |
+------+-----------------+---------------+-----------------+
| 12 |>COS WITH INTERNAL FWDING ONLY |
| | TA | TA | TA |
| | TNOTCR | TNOTCR | TNOTCR |
| | CDRS | BASIC | DSM |
| | CDRC | TTT | BASIC |
| | CDRIND | SUBMSN | TTT |
| | CDRINT | MSN | SUBMSN |
| | COSXCD | MULTRA | MSN |
| | MB | KIESIG | MULTRA |
| | DATA | UUS1IM | KIESIG |
| | CFNR | UUS3 | UUS1IM |
| | VCE | ACTMAN | UUS3 |
| | TTT | | ACTMAN |
| | CFB | | |
| | DSSKEY | | |
| | CW | | |
| | UUS3 | | |
| | ACTMAN | | |
+------+-----------------+---------------+-----------------+
ADD-COSSU:,12,,,,,,,,"COS WITH INTERNAL FWDING ONLY";
CHANGE-COSSU:COS,12,TA&TNOTCR&CDRS&CDRC&CDRIND&CDRINT&COSXCD&MB,,,,,,,;
CHANGE-COSSU:COS,12,DATA&CFNR&VCE&TTT&CFB&DSSKEY&CW&UUS3,,,,,,,;
CHANGE-COSSU:COS,12,ACTMAN,,,,,,,;
CHANGE-COSSU:COS,12,,TA&TNOTCR&BASIC&TTT&SUBMSN&MSN&MULTRA&KIESIG,,,,,,;
CHANGE-COSSU:COS,12,,UUS1IM&UUS3&ACTMAN,,,,,,;
CHANGE-COSSU:COS,12,,,TA&TNOTCR&DSM&BASIC&TTT&SUBMSN&MSN&MULTRA,,,,,;
CHANGE-COSSU:COS,12,,,KIESIG&UUS1IM&UUS3&ACTMAN,,,,,;
So to change a phone to allow external forwarding - CHA-S(B)CSU:STNO=XXXX,COS1=13;
+------+-----------------+---------------+-----------------+
| COS | VOICE | FAX | DTE |
+------+-----------------+---------------+-----------------+
| 13 |>COS WITH EXTERNAL FORWARDING ALLOWED |
| | TA | TA | TA |
| | TNOTCR | TNOTCR | TNOTCR |
| | CDRS | BASIC | DSM |
| | CDRC | TTT | BASIC |
| | CDRIND | SUBMSN | TTT |
| | CDRINT | MSN | SUBMSN |
| | COSXCD | MULTRA | MSN |
| | MB | KIESIG | MULTRA |
| | DATA | | KIESIG |
| | CFNR | | UUS1IM |
| | VCE | | UUS3 |
| | FWDNWK | | ACTMAN |
| | TTT | | |
| | CFB | | |
| | DSSKEY | | |
| | FWDFAS | | |
| | FWDDIR | | |
| | CFSWF | | |
| | CW | | |
| | UUS3 | | |
| | ACTMAN | | |
+------+-----------------+---------------+-----------------+
ADD-COSSU:,13,,,,,,,,"COS WITH EXTERNAL FORWARDING ALLOWED";
CHANGE-COSSU:COS,13,TA&TNOTCR&CDRS&CDRC&CDRIND&CDRINT&COSXCD&MB,,,,,,,;
CHANGE-COSSU:COS,13,DATA&CFNR&VCE&FWDNWK&TTT&CFB&DSSKEY&FWDFAS,,,,,,,;
CHANGE-COSSU:COS,13,FWDDIR&CFSWF&CW&UUS3&ACTMAN,,,,,,,;
CHANGE-COSSU:COS,13,,TA&TNOTCR&BASIC&TTT&SUBMSN&MSN&MULTRA&KIESIG,,,,,,;
CHANGE-COSSU:COS,13,,,TA&TNOTCR&DSM&BASIC&TTT&SUBMSN&MSN&MULTRA,,,,,;
CHANGE-COSSU:COS,13,,,KIESIG&UUS1IM&UUS3&ACTMAN,,,,,;