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CPE Signaling Model
November 2009 341
Figure 52 illustrates an example inter-register exchange in which
the inbound protocol is configured to collect DNIS digits first,
followed by collection of ANI information, and concluding with the
exchange of DNIS category and called line condition. However,
variations on this exchange are possible, resulting from different
settings of the inbound protocol control parameters and the absence
of certain signals in a given variant. For instance, the inbound
protocol is configured to request ANI information following reception
of N DNIS digits. Following completion of ANI collection, the DNIS
collection is resumed. Another example is that a certain variant
might not define the forward signal that indicates the end of the
DNIS string. In this case, the inbound protocol must count the DNIS
digits and signal a request for other information when the required
number of DNIS digits has been collected.
Enabling the R2 Protocol on page 342 provides further detail on the
protocol control parameters, protocol signals, and protocol processing
actions provided by the Brooktrout R2 stack.
Figure 52. Inter-register Signaling
DNIS "digit" 1
Send next DNIS digit
DNIS "digit" 2
Send next DNIS digit
DNIS complete
Send ANI information
ANI catagory
Send next ANI
ANI digit "9"
Send next ANI
ANI digit "8"
Send next ANI
ANI complete
Send DNIS catagory
DNIS catagory
Called line condition (free, busy, etc.)
Backward
Channel (called
number is 12)
Forward
Channel
(calling from
number 98)