8.1.1 Using a VoIP Network with the PBX
PBX IP Address
Types of IP Network
The speech quality depends on the type of IP network in use. Managed IP networks provide better speech
quality compared to unmanaged networks such as satellite communications, where quality of service cannot
Examples of recommended IP networks
Digital Leased Line
IP-VPN (Virtual Private Network)
Peer-to-peer calls between IP telephones installed at different locations may not be possible if packet
communication cannot be established between the respective networks. In this case, you need to
configure the network settings (e.g., a VPN router when using an IP-VPN) to establish packet
Unlike an IP-VPN, which is set up over a network provider's own IP network, an Internet VPN is set up
over the Internet. Internet VPNs are not recommended for VoIP communication because transmission
delays and loss of data are likely to occur.
If multiple Slave units exist in a One-look network using IP-VPN, each Slave unit must have
peer-to-peer communication enabled. Therefore, inform your network administrator and make sure that
the network supports this requirement.
Identifies the location of the PBX in the network during VoIP
Identifies the ID of the logical segment within the corporate LAN,
through which voice packets from IP telephones travel. For details,
refer to "8.1.3 VLAN (Virtual LAN)".
Identifies the value for the DS field in the header of IP packets, which
determines the priority given to packets travelling from IP telephones.
For details, refer to "5.8.4 Setting Diffserv Parameters".
Satellite communications (Very Small Aperture
Terminal system [VSAT], etc.)