[Asterisk-Users] Camp on?

[Patrick]

Hi all,

In .nl there is a feature provided by the incumbent that I would like to
implement for an internal PBX setup. The incumbents feature does the
following (adopted for internal PBX use, so no external/PSTN numbers are
used):

1) pick up phone and dial an internal extension
2) if other side is busy, play a message "press 5 to get connected
   once the other side becomes available"
3) press 5 on phone
4) hangup
5) wait till phone starts ringing
6) pick up phone
7) other extension is automatically dialed again and you should hear it
   ring

I believe this is called camp on. Found some examples on voip-info.org
but they assume that you do not hangup the originating phone. Anyone
have an idea how to implement this feature as described above?

Thanks and regards,
Patrick