[Asterisk-Users] Call forwarding

[Adrian A]

Is there an easy way to allow the users to go to a webpage or dial an
extension and enter a phone number that their extension can be
forwarded to?
I'm using SER+Asterisk so doing this in sip.conf for example would not
work since all users are registered to SER.  Currently in
extensions.conf I have:
exten => s,2,Dial(SIP/${ARG1}@${SERADDRESS},20)
Is there a way to check that the user at ${ARG1} has setup forwarding
and retrieve the forwarding destination?