Dialogic 6.2 Manuale Utente

Enabling the R2 Protocol

November 2009

350

 identifies the set of backward inter-register signals. The 

tones defined are those used to support DNIS and ANI services 

appropriate for customer premise equipment. Not all tones that are 

possible under the ITU recommendations are required nor 

implemented at this time. Certain tones might not be defined in a 

particular variant. In such a case, the values of those tones should be 

set to R2B_INVALID. In addition, certain signals are normally 

expected to have the same absolute signal code whether the forward 

channel is in state DNIS or state ANI. For example, this is true for 

the congestion signal. However, distinct definitions are provided in 

these cases to allow customization for an arbitrary variant. 

Process congestion signal.

DNIS or 

ANI

Process request for next 

ANI digit.

ANI

 

Process request for 

calling party (ANI) 

information.

DNIS

Process call accepted 

without need for Group B 

line condition.

DNIS

Process request for circuit 

nature.

DNIS

Process request for use of 

echo suppressor.

DNIS

Process received  

(Group B) called line 

condition.

Line 

condition