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Applications for SmartNode 4110 Series 22
SmartNode 4520 & 4110 Series User Manual 2 • Applications overview
Application—Analog line extension over IP
A virtual analog line can be created using an FXO and FXS model (see figure 9). The complete signaling and
media (voice, fax, or modem) of the analog phone line is extended over IP. This enables a PBX analog exten-
sion line to be extended to a home office or satellite office. The analog line extension relays DTMF, hook-flash
and CLI to provide full PBX feature access over the IP network (checking voice mail or joining a calling group,
for example).
Figure 9. Analog line extension
Application—ITSP dial-in access
An ITSP can use the SmartNode FXO gateways as dial-in access points to his Internet telephony services (see
figure 10). A user calls a local number, the FXO SmartNode picks up the call and uses a second dial-tone to
dial the remote number. The system can be enhanced with a central call control server providing IVR
announcements, PIN checking, and accounting for the calls.
Figure 10. ITSP dial-in access
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