The callback list message will use the same body as the Post SRSoutput message. It will have a different noun and verb.
There are two types of callback list. One contains in the incident list all of the callers who have requested a callback. This message will have a verb of REQUESTED and a noun of CALLBACKLIST. The second type of callback list is a relatively random sampling of customers downstream of the restored device. This message will have a verb of SUBSET and a noun of CALLBACKLIST.
There are configurable parameters that will set the maximum and minimum percentage of affected customers who will be included in the SUBSET callback list. The maximumCallbackSample and minimumCallbackSample for the subset callback can be set through the srs_rules table. These parameters will default to 50 and 4 percent respectively if not configured explicitly. Both types of callback lists use the same format found in PostSrsOutput_001.xsd.