Allows to finalize the series of ANS reply already sent with a NUL reply.
Inside the one-to-many exchange, it is defined that several ANS reply messages are ended by a NUL reply. This function allows you to sent that one NUL ending reply.
|channel ||The channel where previous ANS reply message was sent.|
|msg_no_rpy ||The message we where replying to and the one to be notified that one-to-many reply have ended.|
- TRUE if the message was sent properly.