Cisco Systems SPA9000 manual Pstn Access and Local Voice Mail

Getting Started	1
Deployment Scenarios

PSTN Access and Local Voice Mail

In this scenario, the customer requires a robust phone system but is not using VoIP services. The SPA9000 Voice System is deployed with a SPA9000 IP PBX, one SPA400 for PSTN access with four FXO ports, and another SPA400 for local voice mail service. Up to 16 IP phones can be installed. Optionally, analog phones or fax machines (not illustrated) can be connected to the two phone ports on the SPA9000.

SPA9000 Voice System Administration Guide 19