Parking a call using Asterisk Manager

Hi, I was wondering if anyone knew anything about how to park a call using the Asterisk Manager interface. I’ve spent all morning on Google without success!

Using a handset, I would park a call by transferring it to extension 70. However I have tried the following and it results in the call being disconnected:

[quote]Action: Redirect
Channel: Zap/1-1
Context: default
Exten: 70[/quote]

Any help greatly appreciated