Transfer fails: Channel: undefined

[Leif Neland]

When trying to transfer an incoming call, answered or not, Click2dial sends "Channel: undefined"
When trying to transfer an outgoing, answered call, Click2dial sends "Channel: null"
Naturally, asterisk complains and does not transfer

This is a capture using ngrep
10.0.0.81 is PC
10.0.0.180 is Asterisk

T +6.751522 10.0.0.81:2863 -> 10.0.0.180:5038 [AP]
  Action: Redirect..Exten: 16..Context: phones..Priority: 1..Channel: undefined....
#
T +0.000102 10.0.0.180:5038 -> 10.0.0.81:2863 [AP]
  Response: Error..
#
T +0.000024 10.0.0.180:5038 -> 10.0.0.81:2863 [AP]
  Message: Channel does not exist: undefined....
#

More complete dump is attached

[Leif Neland (leif-neland)]

Asterisk: Asterisk 1.4.21.2~dfsg-3+lenny1
Debian_version 5.0.7
Click2Dial 1.5.1
XP