6. SERVICE
The server shall stand behind the service line with both feet on the
floor and not touching or straddling the line, and serve the ball
against the front wall above the front-wall service line and below the
16-ft. [4877mm] line before it touches any other part of the court, so
that it shall drop directly, or off the side wall, into his opponent's
court in front of the floor service line without either touching the
floor service line or the center line.
If the server does not so serve, it is a fault, and if it be the
first fault, the server shall serve again from the same side. If the
server makes two consecutive faults, he loses that point.
The server has the option of electing the side from which he shall
commence serving and thereafter, until he loses the service, he shall
alternate between both sides of the court in serving. If the server
serves from the wrong side of court, there shall be no penalty and if
the receiver makes no attempt to return the ball the point shall be
replayed from the proper court.
When one service fault has been called and play for any reason
whatsoever has stopped, when play is resumed the first fault does not
stand and the server is entitled to two services.

7. RETURN OF SERVICE AND SUBSEQUENT PLAY
(a) To make a valid return of service the ball must be struck after
the first bounce and before the second bounce, and reach the front wall
on the fly above the telltale and below the 16-ft. line; in so doing it
may touch any wall or walls within the court before or after reaching
the front wall, except as in (e), below. A service fault may not be
played. If a fair service is not so returned, it shall count as a point
for the server and he shall then serve from the other side of the court.