[Asterisk-Users] Contact header empty in SIP-message

[Johanna Kangas]

Hi,
I have noticed that when I am calling from my Snom-phone to another
Snom-phone through Asterisk, the SIP-message's Contact -header could be
sometimes empty and for example other Snom get no BYE-message.

Here is example of that kind of message:

10 headers, 0 lines
Sending to 192.168.0.32 : 5060 (non-NAT)
Transmitting (no NAT):
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.0.32:5060;branch=z9hG4bK-9sbwo79ob74p
From: <sip:donald at 192.168.0.32>;tag=wxrasulsor
To: "Mickey Mouse" <sip:asterisk at 192.168.0.15>;tag=as700f09c7
Call-ID: 12e8e96a3a7c22da4da00d9e40d49684 at 192.168.0.15
CSeq: 2 BYE
User-Agent: Asterisk PBX
Contact:
Content-Length: 0

Same thing with INVITEs also...
Does this error depend on my configuration or is it Asterisk's bug ?

Asterisk built from CVS-07/11/03-14:12:25.

Thank you for any help!
-Johanna