Dialogic 6.2 Manuale Utente

CPE Signaling Model

November 2009

337

Line Signaling) and MF compelled (MFC) (R2 Inter-register 

Signaling). Signaling is controlled via the BSMI interface in a 

manner similar to Q.931 and LEC protocols.

This chapter applies only to BSMI (low-level call control) 

users. Bfv call control users cannot use this information.

The LEC protocols are described in 

.

Please contact Dialogic Technical Services and Support for a list of 

supported variants of the R2 protocol. See the Bfv API Reference 

Manual, Volume 5 for details.

This section describes the general signaling model that is 

implemented by the Brooktrout R2 stack. This model is valid for a 

large number of national variants that are found worldwide. 

Customization via the BSMI will not be possible for variants that are 

not described by this model.

The line signaling part of the protocol is illustrated in 

. The 

Brooktrout implementation assumes that trunks are configured for 

“both-way” working, that is outbound and inbound calls are possible 

on the same trunk. Outbound-only and inbound-only trunk 

configuration is not currently supported. In the discussion to follow, 

“forward” is synonymous with outbound and “backward” is 

synonymous with inbound.