Altigen AltiWare OE Version 4.6 Administration Manual page 244

Setting General Trunk Attributes
Parameter
Or
Apply to...
Note:
In order for back-to-back T1 and tie trunk T1 configurations to
perform properly, it is recommended that you use the system's
default incoming call sequences:
7-18 AltiWare OE System Installation & Administration Manual
Description
Sets up an additional, alternative sequence. You can select
another set of up to five incoming symbols to collect.
Not checking any box is equivalent to checking 'None' in
the first field.
The default sequence is:
"DID/DNIS"
If appropriate, you can use this button, as described in
"Configuring One or Multiple Trunks" on page 7-3, to
apply the Caller ID Collection to multiple T1 trunks.