8 Voice Over IP
VoIP Applications
VoIP Applications
Introduction This section describes typical applications of VoIP and the benefits of implementing
voice over an IP network.
Applications VoIP can be used to provide cost effective, long distance phone services over the IP
network. Figure 5 illustrates a network using VoIP to support fax and voice calls
between two branch offices in different locations.
Figure 5. VoIP Applications for Small Branch Offices
In Figure 6, the PathBuilder S24x, 26x, and 27x switches act as gateways to route
calls over the IP network. With this implementation, the caller only needs to call a
local number to start a long distance conversation.
Figure 6. VoIP Applications for Long Distance Telephone Service
Figure 7 illustrates a network supporting voice within an Intranet and voice over a
public or private frame relay network using 3Com’s Voice Relay.
Figure 7. VoIP Applications and Voice Relay Support
PBX
Intranet
Fax
PB S200 PB S200
Intranet
PSTN
PSTN
PB S200 PB S200
Intranet
Frame
Relay
PB S200 PB S200 PB S200
