Help > Functions and applications > Network interface (second)
Network interface (second)
A second network interface can be configured in the PBX. Accordingly, two IADs (Integrated Access Devices) can be directly connected to the PBX and configured.
Requirement:
•COMtrexx Business: Upgrade with a NET-Modul
•COMtrexx Flex: Upgrade with a COMtrexx Flex GbE NET Module
•COMtrexx Next: Upgrade with a USB network adapter
*Important: You can find the technical requirements and a list of compatible USB network adapters at: Auerswald Support
•COMtrexx VM: Installation of a second network adapter/card
*Further help under COMtrexx hardware variants
*Further help under COMtrexx VM variants
The following scenarios for using two network interfaces are possible:

External VoIP telephony completely on LAN connection 2
•At the connections LAN 1 and LAN 2, an IAD is connected in each case.
•The internal VoIP telephony and Internet connection are realised via LAN 1.
•The external VoIP telephony is realised via LAN 2. There is no Internet connection at LAN 2.

Single VoIP providers separately on the LAN 2 connection
•At the connections LAN 1 and LAN 2, an IAD is connected in each case.
•The VoIP telephony and Internet connection are realised via LAN 1.
•The external VoIP telephony with single VoIP providers is realised via LAN 2.

Internal VoIP telephony on the LAN 2 connection
•An IAD is connected to LAN 1.
•The data transmission and external VoIP telephony are realised via LAN 1.
•The internal VoIP telephony is realised via LAN 2.
Configuration 
•Configuring IP addresses and subnets for the second network interface.
−Network > Interfaces
*Note: The module or network adapter must be detected before configuration can take place.
*Important: Network adapters are not hot-pluggable. They require the system to be restarted or shut down in order to be recognised safely.
•Configuring gateways and routes for the second network interface.
−Network > Routing
•Selecting the used Internet access for the VoIP provider.
−Exchange lines > Providers and Accounts > > SIP
•Selecting network interface of the VoIP registrar.
−Administration > VoIP > VoIP configuration > SIP