31 VoIP Subscriber Gateways
Determination of Internet connection availability is performed by transmitting the ICMP Echo-
Requests via key channel to the service addresses specified in section ‘Check internet connection
availability’. If the response to echo-test is received then decision about Internet connection
availability via main channel is taken otherwise decision about transition to backup channel is taken.
After transition to backup channel, the device continues to poll ping-servers via the preferred channel
and if even one server gets answer the device returns back to the preferred channel.
When you select connection mode, ‘Only wireless’ or ‘Go on to the backup channel
automatically’ you will see the link for switching to the 3G modem settings on the right side (it is
available only for Internet service):
- Provider – provider name (arbitrary);
- Active provider – when checked, provider is active;
- Connection protocol – when 3G-modems are used, select PPPoE protocol; when 4G-
modems are used, select DHCP protocol;
- User Name – user name for authentication (fill in, if required);
- Password – password for authentication (fill in, if required);
- Service-Name – ‘Service-Name’ tag is used during establishing PPP connection (full if it is
required);
- MTU – maximum size of data block, by default it is 1500;
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