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Enabling the R2 Protocol
November 2009 346
Backward Channel Signal Definitions
sendNextDigitDNIS Signal request for next DNIS digit
(state DNIS).
Table 20
sendLastButOneDigitDNIS Signal request for last-but-one
DNIS digit (state DNIS). This
signal is not currently used.
Table 20
sendCallCategoryAndSwitch
ToGroupB_DNIS
Requests transmission of the Call
Category and switch of the forward
channel to reception of the Group B
line condition (state DNIS).
Table 20
congestion Signals congestion (state DNIS). Table 20
sendCallingPartyCategory Requests transmission of the
calling party information starting
with the Calling Category (state
DNIS).
Table 20
callComplete_
SetUpSpeechPath
Signals call acceptance, with
charge, without the need for the
Group II/Group B exchanges (state
DNIS).
Table 20
sendLastButTwoDigitDNIS Refer to ITU A-7. This signal is not
currently used.
Table 20
sendLastButThreeDigitDNIS Refer to ITU A-8. This signal is not
currently used.
Table 20
sendFirstDigitDNIS This signal is not currently used. Table 20
sendNextDigitANI Request transmission of the next
ANI digit (state ANI).
Table 20
changeFrom_ANI_To_DNIS_
SendNextDigit
Signal return to DNIS digit
collection, requesting the next
DNIS digit (state ANI).
Table 20
changeFrom_ANI_To_DNIS_
SendLastDigit
Signal return to DNIS digit
collection, requesting the last
DNIS digit. This signal is not
currently used. (State ANI).
Table 20
Table 19. R2 MFC Inter-register Signaling Parameters (Continued)
Name Description Units Range