Redundant Network Interfaces

sipXpbx does not support multiple IP interfaces

It may or may not be possible to run sipXpbx on a system that has multiple IP interfaces, but the results may be unpredictable and it is not recommended.

It is possible to use multiple interfaces for redundancy if they all use the same IP address. Redhat calls this Channel Bonding, and it works very well.

Redhat documentation on Channel Bonding Interfaces