Yes, this is the exact usage case for a FULL OUTER JOIN:
COALESCE(t1.PhoneNbr, t2.PhoneNbr) AS PhoneNbr,
COALESCE(t1.Interval, t2.Interval) AS Interval,
FROM [Table 1] t1
FULL OUTER JOIN [Table 2] t2 ON t2.PhoneNbr = T1.PhoneNbr AND
t2.Interval = t1.Interval
ORDER BY 1, 2
SQL DBA,SQL Server MVP(07, 08, 09) Prosecutor James Blackburn, in closing argument in the Fatal Vision murders trial: "If in the future, you should cry a tear, cry one for them [the murder victims]. If in the future, you should say a prayer, say one for them. And if in the future, you should light a candle, light one for them."