PassFinder AP2520 VoIP Router/Gateway Operation Manual
Version 1.10 / Mar. 2002
AddPac Technology Co., Ltd.
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174
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5.3.2.
Dial Peer Configuration
The key point to understanding how Voice over IP functions is to understand
dial peers. Each dial peer defines the characteristics associated with a call leg.
A call leg is a discrete segment of a call connection that lies between two
points in the connection. All the call legs for a particular connection have the
same connection ID.
There are two different kinds of dial peers:
z
POTS---Dial peer describing the characteristics of a traditional telephony
network connection. POTS peers point to a particular voice port on a
voice network device.
z
VoIP---Dial peer describing the characteristics of a packet network
connection; in the case of Voice over IP, this is an IP network. VoIP peers
point to specific VoIP devices.
5.3.2.1.
Inbound Dial Peer versus Outbound Dial Peer
Dial peers are used for both inbound and outbound call legs. It is important to
remember that these terms are defined from the
router's
perspective. An
inbound call leg originates
outside
the router. An outbound call leg originates
from
the router.
For inbound call legs, a dial peer might be associated to the calling number or
the port designation. Outbound call legs always have a dial peer associated
with them. The destination pattern is used to identify the outbound dial peer.
The call is associated with the outbound dial peer at configuration time.
POTS peers associate a telephone number with a particular voice port so that
incoming calls for that telephone number can be received and outgoing calls
can be placed. VoIP peers point to specific devices (by associating destination
telephone numbers with a specific IP address) so that incoming calls can be
received and outgoing calls can be placed. Both POTS and VoIP peers are
needed to establish Voice over IP connections.
Establishing communications using Voice over IP is similar to configuring an IP
static route: you are establishing a specific voice connection between two
