[Serusers] iptel.org problems

[Klaus Darilion]

Hi!

I have problems receiving calls when I'm registered to iptel.org using 
Windows Messenger 4.7 (which usually workes fine).

Every incoming INVITE will be answered with a 400 Bad Request by 
Messenger. It is independent from the caller's user agent (tested with 
messenger and xlite). Furthermore, if the caller dials to me directly 
without using iptel's proxy it also works. Therefore, I think the 
problem is related to iptel's proxy.

Below is the dump of the incoming INVITE which is a Bad Request (says 
Messenger). I couldn't find any problems, accept that the 
Proxy-Authorization: header is still present.

regards,
klaus


INVITE sip:128.131.80.218:9227 SIP/2.0
Max-Forwards: 10
Record-Route: 
<sip:klaus3000 at 195.37.77.101;ftag=db80b783-e78f-44e3-999d-392dc5604172;lr>
Via: SIP/2.0/UDP 195.37.77.101;branch=z9hG4bK5b8a.4006c915.1
Via: SIP/2.0/UDP 128.131.80.129:10585
From: "kurth" <sip:kurth at iptel.org>;tag=db80b783-e78f-44e3-999d-392dc5604172
To: <sip:klaus3000 at iptel.org>
Call-ID: 9c446f6d-49a7-4e64-8271-b67640df2a72 at 128.131.80.129
CSeq: 2 INVITE
Contact: <sip:128.131.80.129:10585>
User-Agent: Windows RTC/1.0
Proxy-Authorization: Digest username="kurth", realm="iptel.org", 
algorithm="md5", uri="sip:klaus3000 at iptel.org", 
nonce="409a60508b7d5cdbd4c83d73d676693c35750df5", 
response="1ed41c442263572c152711fd1670a341"
Content-Type: application/sdp
Content-Length: 454
P-hint: USRLOC

v=0
o=pc129 0 0 IN IP4 128.131.80.129
s=session
c=IN IP4 128.131.80.129
b=CT:1000
t=0 0
m=audio 40746 RTP/AVP 97 111 112 6 0 8 4 5 3 101
a=rtpmap:97 red/8000
a=rtpmap:111 SIREN/16000
a=fmtp:111 bitrate=16000
a=rtpmap:112 G7221/16000
a=fmtp:112 bitrate=24000
a=rtpmap:6 DVI4/16000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:4 G723/8000
a=rtpmap:5 DVI4/8000
a=rtpmap:3 GSM/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16