Hi Ali,
This is supported. Have a look;
Message Playback Controls
When listening to messages, a subscriber can fast-forward (advance) *Press 9, pause *Press 8, or rewind a message *Press 7. Cisco Unity Express currently does not support speed acceleration or deceleration controls. The rewind and fast-forward actions skip by 3-second increments within the message.
Message pause halts playout of the current message. The subscriber is prompted every 50 seconds to restart the message playout, up to a maximum of 2.5 minutes, at which point the call is disconnected. In pause mode, the subscriber can take the following actions:
Rewind and resume Rewinds 3 seconds and restarts message playout
Resume Restarts message playout
Fast-forward and resume Skips forward by 3 seconds and restarts message playout
At any time during message playout, a subscriber can press 7 (rewind) to repeat the last 3 seconds of the voice message. This is useful if the caller left his or her phone number and the subscriber wants to repeat this segment.
http://www.cisco.com/en/US/products/sw/voicesw/ps5520/products_implementation_design_guide_chapter09186a0080576186.html#wp1010443
Here is the User Guide which indicates Pressing 9 Forwards ahead 3 seconds in the Message;
http://www.cisco.com/application/pdf/en/us/guest/products/ps5520/c1626/ccmigration_09186a00808254f5.pdf
Hope this helps!
Rob
