Not sure how the US ISDN works but here where I used to work you couldn't put a pause after a number on ISDN. From memory we added a @P (await answer and pause 1 second) at the end of the number which and then input account code to the carrier.
From some old documentation I did about 15 years ago. This was for a speed dial but my work in ARS cases.

Speed dial: Await answer then send digits (ISDN)
Topaz and IPK2 MB 13.04
Dial string should look like 95551212@P123456
95551212 = number dialed. @ = await answer then process what follows
P = 1 send pause, 123456 = digits to be sent after the pause.
This is for ISDN only. Analog trunks just use a series of pauses after the first string of digits..


Regards,

Paul W
Now back to a 0 day week. Love these 7 day weekends.