15 Apr
2005
15 Apr
'05
8:16 p.m.
Paul,
Sorry it this was unclear. I meant to say that I don't think UA should
respond with ACK to provisional response (i.e. 100 Trying). I just scanned
through an RFC and did not see anywhere where it says provisional responses
should be ACKed. Also, I am unclear on why UA changed CSEQ. Any ideas on
that?
Alex
_____
From: Java Rockx [mailto:javarockx@gmail.com]
Sent: Friday, April 15, 2005 2:12 PM
To: Alex Vishnev
Cc: serusers(a)lists.iptel.org
Subject: Re: [Serusers] Another Looping Question
Thanks Alex.
So just to be clear, are you saying this:
1) When ser receives an INVITE it does not need to reply with "100 Trying"
2) When the SER tm module sends back the 100 Trying, the SIP UA should not
be changing the Cseq header?
Regards,
Paul
On 4/15/05, Alex Vishnev <avishnev(a)optonline.net> wrote:
Paul,
It looks like UA ACK 100 Trying. First of all I don't believe this is
needed. Second of all, it changes CSEQ from 101 INVITE to 100. I think
that's not valid at all.
HTH
Alex
_____
From: serusers-bounces(a)lists.iptel.org [mailto:
<mailto:serusers-bounces@iptel.org> serusers-bounces(a)lists.iptel.org] On Behalf
Of Java Rockx
Sent: Friday, April 15, 2005 10:46 AM
To: serusers(a)lists.iptel.org
Subject: [Serusers] Another Looping Question
Hi All.
Below is a snippet of an INVITE and you can see the usual "trying - your
call is important to us" in the dialog. Anyhow, for some reason SER
occasionally attempts to sent the ACK to itself, which causes a looping
condition. The last ACK shown is the start of the looping condition.
It only happens on occasion. SER should have consumed the ACK rather than
attempted to forward it.
Can anyone explain this?
Regards,
Paul
IP Legend
-------------------
10.3.0.221 - SER (behind a Cisco 3600 so ALG rewrote the IPs)
69.36.46.178 - NATed SIP UA
U 2005/04/15 02:19:16.252614 69.35.46.178:5060 -> 10.3.0.221:5060
INVITE sip:8187768080@sipdev.mycompany.net SIP/2.0.
Via: SIP/2.0/UDP 192.168.1.102:5060;branch=z9hG4bK3915905414.
From: Test User <sip:3215591439@sipdev.mycompany.net>;tag=1465261089.
To: <sip:8187768080@sipdev.mycompany.net>.
Call-ID: 2671219156(a)192.168.1.102.
CSeq: 101 INVITE.
Contact: <sip:3215591439@192.168.1.102:5060>.
Proxy-Authorization: Digest username="3215591439",
realm="sipdev.mycompany.net",
nonce="425f5e0de25efdb3f5a6125dcf2147bf30fe9177",
uri="sip:8187768080@sipdev.mycompany.net ",
response="61996c3bdc10990fec7e245751777516", algorithm=MD5,
cnonce="ae02e47a3355bada49ce344c92f48587", qop=auth, nc=00000002.
max-forwards: 70.
Allow: INVITE, ACK, CANCEL, BYE, REFER, NOTIFY.
Content-Type: application/sdp.
Content-Length: 180.
.
v=0.
o=- 32014 3005 IN IP4 192.168.1.102.
s=-.
c=IN IP4 192.168.1.102.
t=0 0.
m=audio 13456 RTP/AVP 18 0 8 2 4 101.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:20.
.
#
U 2005/04/15 02:19:16.276216 10.3.0.221:5060 -> 69.35.46.178:5060
SIP/2.0 100 trying -- your call is important to us.
Via: SIP/2.0/UDP
192.168.1.102:5060;branch=z9hG4bK3915905414;rport=5060;received=
69.35.46.178 <http://69.35.46.178> .
From: Test User <sip:3215591439@sipdev.mycompany.net>;tag=1465261089.
To: <sip:8187768080@sipdev.myvox.net>.
Call-ID: 2671219156(a)192.168.1.102.
CSeq: 101 INVITE.
Content-Length: 0.
.
#
U 2005/04/15 02:19:16.792795 69.35.46.178:5060 -> 10.3.0.221:5060
ACK sip:8187768080@sipdev.mycompany.net SIP/2.0.
Via: SIP/2.0/UDP 192.168.1.102:5060;branch=z9hG4bK3499714875.
From: Test User <sip:3215591439@sipdev.mycompany.net>;tag=1465261089.
To:
<sip:8187768080@sipdev.mycompany.net>;tag=cdbfe46960d7566fcbe09f199f2b328d.c
2bb.
Call-ID: 2671219156(a)192.168.1.102.
CSeq: 100 ACK.
Content-Length: 0.
.
#
U 2005/04/15 02:19:16.912146 10.3.0.221:5060 -> 10.3.0.221:5060
ACK sip:8187768080@sipdev.mycompany.net SIP/2.0.
Max-Forwards: 10.
Record-Route: <sip:10.3.0.221;ftag=1465261089;lr>.
Via: SIP/2.0/UDP 10.3.0.221;branch=0.
Via: SIP/2.0/UDP 192.168.1.102:5060;received= 69.35.46.178
<http://69.35.46.178> ;branch=z9hG4bK3499714875.
From: Test User <sip:3215591439@sipdev.mycompany.net>;tag=1465261089.
To:
<sip:8187768080@sipdev.mycompany.net>;tag=cdbfe46960d7566fcbe09f199f2b328d.c
2bb.
Call-ID: 2671219156(a)192.168.1.102.
CSeq: 100 ACK.
Content-Length: 0.
P-hint: Local Destination.
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