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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.
Note: 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 Chapter , Robbed Bit Signaling
on page 264.
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.
CPE Signaling Model
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 Table 17. 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.