asterisk users - Feb 2005 - clicktocall via manager with cisco 7905

Hi all,

I have a Cisco 7905g with the default cm firmware. It is
connected to * using chan_sccp.so.
Normal operations with this phone work perfect.
Now I'm implementing a click to call app in php.
This php app connects to the manager interface and sends the
following down the line:
$this->_write($fp, "Action: Originate");
$this->_write($fp, "Channel: ".$this->user_device);
$this->_write($fp, "Context: ".$this->context);
$this->_write($fp, "Exten: ".$this->whotocall);
$this->_write($fp, "Priority: 1");
$this->_write($fp, "");
$this->_write($fp, "Action: Logoff");

where $this->user_device = "SCCP/michiel", $this->context
"default" and $this->whotocall = my mobile nr

If I run this script my Cisco starts ringing, so far so
good. If I pick up the Cisco, it gives me a ringing tone, so
far so good. When I pick up my mobile, the Cisco keeps
giving me a ringing tone, like it doesn't notice I picked up
the other end.
When I replace the device with "SIP/michiel", wich is a
grandstream budgetone 101 all works wonderfull.

This is what I see on the * CLI:
  == Manager 'covide' logged on from 192.168.1.61
 SCCP trying to call SCCP, format 4, data, michiel
    -- New channel context: default
    -- Asterisk request to call: SCCP/michiel-00000004
  ==  >> Got message OffHookMessage
    -- Device d=0x8107718 s=0x80cc6f0 s->d->s=0x80cc6f0 Taken Offhook
  == Manager 'covide' logged off from 192.168.1.61
    -- Executing Dial("SCCP/michiel-00000004",
"Modem/g1:xxxxxxxxxx|50|Ttr") in new stack
    -- Called g1:xxxxxxxxxx
    -- Asked to indicate '3' (Dialing) condition on channel
SCCP/michiel-00000004
    -- Sending tone 36
    -- Modem[i4l]/ttyI3 answered SCCP/michiel-00000004
    -- Asked to indicate '-1' (Unknown (-1)) condition on channel
SCCP/michiel-00000004
    -- Hungup 'Modem[i4l]/ttyI3'
  == Spawn extension (default, xxxxxxxxxx, 1) exited non-zero on
'SCCP/michiel-00000004'

Anyone can help me with this?

Michiel