irlitewave

I have been setting up this new MICS 5.0 system with a Nortel Flash and PRI lines with DID. I have the DID ringing on the sets that they need to be on, but the way they route to voicemail is not working the way I need it to when a user is on a call example.

Line 147 is set to recv digits 2223 and if busy go to prime
prime DN is 2223
on dn 2223 line 147 is set to ring only with appearences 2
there are 2 intercom keys on 2223
fwd no answer is set to 2251 the flash
dnd on busy is set to no
If I fwd on busy to 2251 the 2nd line does not ring and goes to voicemail
If I fwd on busy to none the 2nd int rings 4 times then goes to voicemail if it is not answered
Now comes the fun part,
The line also rings on the recptionist phone 2221,
2221 is set to line 147 ring only with 2 appear.
2221 has 4 intercom keys
if 2223 has 2 lines in use and a third call comes in, but the recptionist fails to answer it it goes to her voicemail
the recp line is set to roll over to voicemail after 6 rings and all other lines after 4
Is there any way to make it so if 2223 has both lines busy it will go to the proper voicemail box instead of the recptionist voicemail?

What I would really like:

int Line 1 rings and is answered
another call comes in and a short beep is heard like call waiting and the second int line is answered
a third call comes in and rings at the recp and if she does not answer it goes to voicemail for the original line.

I'm cutting this system over tonight, so any input would be helpful