B

A originals

C

originals

duplicatesoriginal becomes trigger

duplica

tedup

licate

duplica

te

original becomes trigger

A

B

C

originals

duplicatesoriginal becomes trigger

originals

originals

duplica

te

priority=1priority=0

priority=0 priority=1

1

2

3 4

5

6

7

Call Processing Section (P)

Call Holding Section (H)

Resource Section (R)