asterisk users - Sep 2004 - RE: An old problem still hanging around?

Having just run the command "sip show channels" I get a list of
channels
even though there is no one on the phone (we only have 4 so it's easy to
tell).

Here is what I get:

Peer             User/ANR    Call ID      Seq (Tx/Rx)   Format
192.168.0.22     (None)      4c81ac8e90c  00101/00000   UNKN  
192.168.0.22     (None)      984ee48048d  00101/00000   UNKN  
192.168.0.22     (None)      200d9d37123  00101/00000   UNKN

Is this normal?  Why just one phone (a Grandstream Handytone ATA)?

Running "sip show channel 984ee48048d" I get the output below so it
seems
"active":

* SIP Call
  Direction:              Incoming
  Call-ID:                984ee48048d9e01c@192.168.0.22
  Our Codec Capability:   524302
  Non-Codec Capability:   1
  Their Codec Capability:   0
  Joint Codec Capability:   0
  Format                  UNKN
  Theoretical Address:    192.168.0.22:5060
  Received Address:       192.168.0.22:5060
  NAT Support:            RFC3581
  Our Tag:                1190462248
  Their Tag:              
  SIP User agent:         
  Need Destroy:           0
  Last Message:           
  Promiscuous Redir:      No
  Route:                  N/A
  DTMF Mode:              rfc283

Here's a quote from a post to an earlier question by someone seeing a
similar list in Jun/Jul this year.

<QUOTE>
This behavior was observed by several people for a short period of time 
and then seemed to have disappeared with a cvs versions starting around 
1.390 - 1.394 (chan_sip.c) according to my  observations (more like a 
guess actually) couldn't exactly pinpoint the patch that stopped it.
</QUOTE>

My version of asterisk is from HEAD on 2004-09-19.  Should I be concerned?

Thanks 

Bill Seddon