[Serusers] Another Looping Question
Francesco Bottà
francesco.botta at eutelia.it
Fri Apr 15 20:28:14 CEST 2005
Hi Paul,
I'm testing UTstarcom iAN-02EX but i'm not receiving this sort of PR'ACK' to the 100 Trying Response from SER....my firmware version is:
Firmware Version: V1.8.2.17a
I hope this help you...
Regards,
Verbal
----- Original Message -----
From: Java Rockx
To: Alex Vishnev
Cc: serusers at lists.iptel.org
Sent: Friday, April 15, 2005 8:19 PM
Subject: Re: [Serusers] Another Looping Question
Perhaps it is a firmware bug. I'm going to check with the manufacturer.
By the way, this ATA is a UTstarcom iAN-02EX in case you're wondering.
Regards,
Paul
On 4/15/05, Alex Vishnev <avishnev at optonline.net> wrote:
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 at gmail.com]
Sent: Friday, April 15, 2005 2:12 PM
To: Alex Vishnev
Cc: serusers at 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 at 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 at lists.iptel.org [mailto: serusers-bounces at lists.iptel.org] On Behalf Of Java Rockx
Sent: Friday, April 15, 2005 10:46 AM
To: serusers at 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 at sipdev.mycompany.net SIP/2.0.
Via: SIP/2.0/UDP 192.168.1.102:5060;branch=z9hG4bK3915905414.
From: Test User <sip:3215591439 at sipdev.mycompany.net>;tag=1465261089.
To: <sip:8187768080 at sipdev.mycompany.net>.
Call-ID: 2671219156 at 192.168.1.102.
CSeq: 101 INVITE.
Contact: <sip:3215591439 at 192.168.1.102:5060>.
Proxy-Authorization: Digest username="3215591439", realm="sipdev.mycompany.net", nonce="425f5e0de25efdb3f5a6125dcf2147bf30fe9177", uri="sip:8187768080 at 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.
From: Test User <sip:3215591439 at sipdev.mycompany.net>;tag=1465261089.
To: <sip:8187768080 at sipdev.myvox.net>.
Call-ID: 2671219156 at 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 at sipdev.mycompany.net SIP/2.0.
Via: SIP/2.0/UDP 192.168.1.102:5060;branch=z9hG4bK3499714875.
From: Test User <sip:3215591439 at sipdev.mycompany.net>;tag=1465261089.
To: <sip:8187768080 at sipdev.mycompany.net>;tag=cdbfe46960d7566fcbe09f199f2b328d.c2bb.
Call-ID: 2671219156 at 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 at 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;branch=z9hG4bK3499714875.
From: Test User <sip:3215591439 at sipdev.mycompany.net>;tag=1465261089.
To: <sip:8187768080 at sipdev.mycompany.net>;tag=cdbfe46960d7566fcbe09f199f2b328d.c2bb.
Call-ID: 2671219156 at 192.168.1.102.
CSeq: 100 ACK.
Content-Length: 0.
P-hint: Local Destination.
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