How Fallback Routing Works - Nortel BCM50 Configuration Manual

Chapter 43 VoIP trunk gateways 375

How fallback routing works

CDP network: User dials 2233 (remote system DN: 2233; remote identifier/destination digit: 2).
The system absorbs the 8, no other digits are absorbed and the system dials out 2233.
If the call falls back to PSTN line, the system still only absorbs the 8. If the PSTN line is on a
private network, the system dials out 2233. If the PSTN line is a public line, the system dials out
the public access number to the remote system in front of the 2233. Refer to Figure 115.
Networking Configuration Guide