18.16. Technical details

The FireBrick operates according to well established technical standards within specific design constraints which allow it to operate efficiently handling thousands of calls.

The design is intended to work with all common VoIP handsets and carriers. If you experience any difficulty with a carrier or a VoIP device, please contact the FireBrick support team, ideally with a full debug log.

Tip

It is possible to set different source IP addresses to be used per carrier - obviously, to work, these have to be IP addresses that the FireBrick has, but it can be useful to force registration via specific addresses. It is also possible to define a default IPv4 and IPv6 source address to be used for messages that can be authenticated, thus allowing different source addresses to be used for messages to which a challenge must be sent and those that do not expect a challenge. This can be useful when dealing with remote boxes that have to decide on a challenge based on source address.