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The ISDN S0 port of Vigor2820VS/VigorIPPBX 2820 can connect with two ISDN phones
or connect to an ISDN PBX with multiple ISDN devices connected.
For there are so many ISDN devices, we can set different MSN numbers for mapping
different ISDN devices.
Below shows an example of connection structure for your reference.
Note: ISDN Phone adapter must connect to Vigor Router's ISDN S0 port, otherwise
Vigor Router will not provide power/isdn signal to the S0 port.
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VigorIPPBX 2820 Series User's Guide
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