Perhaps you could be more specific on the .wav file you are trying to send.
Per the docs. it indicates that UC can send "text notifications"
http://www.cisco.com/en/US/docs/voice_ip_comm/connection/8x/administration/guide/8xcucsag200.html#wp1049727
Setting Up SMTP Message Notifications in Cisco Unity Connection 8.x
By using SMTP, Cisco Unity Connection can send text notification to notify users that they have received a new message or calendar event. Text notifications can be sent to any device that supports SMTP, for example, email addresses, mobile phones, and text pagers.
To enable Connection to send text notifications by using SMTP, your Connection server must be configured to relay messages through a smart host. If Connection is configured to deliver text notifications but has not been configured to relay messages to a smart host, the notification attempt fails and the notification is put in the Connection SMTP Server badmail folder.