ISDN, overlap and open dialing plans

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Hi,

I’ve got the following setup:

PSTN/ISDN < ---- E1-----> Asterisk < ---- E1-----> Alcatel 4400 PBX
< ----> TDM phones

When a TDM phone is dialing out to a national number, it seems that
the PBX is using enbloc dialing.
When a TDM phone is dialing out to an international number (variable
length numbers), it seems that the PBX is using overlap dialing as
Asterisk is currently receiving truncated numbers.

What is the best way to deal with such situations ?
1. configure PSTN in enbloc dialing and tweak dialplan to mimic
overlap dialing ?
2. or configure both PTSN and PBX spans in overlap mode ?
Suggestions ?

Regards