Introduction |
Figure 5-4 shows how the application in Figure 5-3 would be set up if the user’s PBX was not connected to the system.
The disadvantage of this configuration is that the PBX may not be able to support two D channels, may not be able to handle the differences in D channel protocols between the two carriers, and may not be able to route calls to the appropriate carrier.
Carrier A | Carrier B |
ISDN Switch | ISDN Switch |
Network Side | Network Side |
23B+D | 23B+D |
User Side | User Side |
ISDN PBX
Figure 5-4. ISDN-PRI Links to Two Carriers
Server Cards |
