BCM 4.0 Alternate route Absorbed digits

[MagnaRGP]

Good day all.

I'm trying to finesse routing on a BCM 4.0 (SU14 latest patch)to allow calls to an extension at another site to fail to the other site's main PSTN number if all VoIP trunks are busy.

I know about building a routing service etc. The issue is when I attempt to add alternate routes under the VoIP schedule for a destination code, the absorbed digits field is greyed out and set to all. For ex:

Normal sched:

9A = Rt 1 Abs 1 (Rt 1 = BlocA (PRI) type Public)

Under VoIP sched, I can only end up with 9A Rt 1 Abs ALL, so if I activate the schedule, the users can't dial out.

Here are my normal dest codes (all work):

2A = Rt 2 abs 0 (IP pool, type private)
911 = Rt 1 abs 0 (BlocA type public)
91A = Rt 1 abs 1
9A = Rt 1 abs 1

What I want to achieve is for 2A:

First choice Rt 2 abs 0
Second choice Rt 3 abs 4 inst 1NPANXXABCD

Any thoughts?

Thanks.