[asterisk-users] SIP Bad request protocol Packet on Asterisk 1.4.18

[Remco Barendse]

Hi all!!

I have a really weird problem. I upgraded 2 Asterisk 1.2 boxes to Asterisk 
1.4.18. Both are home PBX's and both boxes register to a SIP DID at
exactly same provider. One box runs without errors on the console, the 
other box keeps repeating :

[Feb 11 23:40:29] WARNING[11292]: chan_sip.c:6705 
determine_firstline_parts: Bad request protocol Packet

When i set debug on, it seems to come from that SIP DID.
<--- SIP read from 82.101.62.99:5060 --->
Cirpack KeepAlive Packet
<------------->
[Feb 11 23:37:59] WARNING[11292]: chan_sip.c:6705 
determine_firstline_parts: Bad request protocol Packet
--- (1 headers 0 lines) ---

What i don't understand is why i get this message on one box only?

Ideas anyone?