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1.2 Network Devices and Numbering Plan
1.2.1
Network Application
QSIG Network Interface
QSIG is a protocol based on ISDN (Q.931) that offers enhanced PBX features in a private network.
The QSIG network supports private communications by the TIE line service method. Implementation
of VoIP Gateway Cards provides a VoIP interface to employ a QSIG network between PBXs at
different locations by using an IP network instead of conventional telephone networks.
Types of IP Network
The VoIP Gateway Card's quality of performance depends on the type of IP network in use. Managed
IP networks provide better quality of service compared to unmanaged networks such as the Internet,
where quality of service is not guaranteed.
Examples of recommended IP networks
•
Digital Leased Line
•
IP-VPN (Virtual Private Network)
•
Frame Relay
Note
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. As delays and loss in data transmission are likely to occur over the
Internet, an Internet VPN is not recommended for use.
Firewall
A firewall protects the internal networks of an organization against unauthorized penetration from
outside. When routing a VoIP network through a firewall, some performance degradation may result.
If for practical reasons you must route the VoIP network through a firewall, refer to "A1.3 Network
Devices" for more details.
Using the KX-TDA0490 with Other KX-TDA Series VoIP Gateway Cards
When using the KX-TDA0490 in a network that contains other KX-TDA series VoIP Gateway Cards,
keep in mind the following points:
1.
Making and Receiving Calls
Calls can be made and received between the KX-TDA0490 and other KX-TDA series VoIP
Gateway Cards. However, the KX-TDA0480 requires a special setting to be able to communicate
with the KX-TDA0490 on the network. Refer to "D1 Considerations in Installation" for more
details.
2.
Using QSIG Services
All QSIG services available with the PBX can be used between the KX-TDA0490 and KX-
TDA0484/KX-TDA5480. However, CLIP service is the only available QSIG service between the
KX-TDA0490 and KX-TDA0480.
8
Getting Started
Not recommended
•
Internet (including an Internet VPN)
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