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/1xx timeout/ and /2xx timeout/ - two timeout parameters, allow limiting amount of time the Softswitch waits for the call to be answered before sending the call over to the next available Connection. First timeout, called 1xx timeout, limits amount of time the switch waits for any session progress response from the Connection (typically 180 Ringing or 183 Session Progress), it allows for a detection of non-functional or unreachable Connections. The second timeout, 2xx timeout, limits amount of time the switch will be waiting for the call to be answered before trying to send it to the next available Connection. The timeouts work concurrently, so that whichever happens first “wins”