How to set TON to unknown and NPI to 'ISDN/Telephony...'

Is there any way to setup TON to unknown and NPI to ‘isdn-telephony/E.164’ ?

Asterisk 1.6 allows you to specify the TON and NPI seperately. This is a new feature that was introduced in Asterisk 1.6.

Read between lines 109-133 of this config file: … iew=markup

It tells you how to individually set the TON and NPI in the dialplan(extensions.conf).