[Serusers] Another Looping Question

[Java Rockx]

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 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 <http://10.3.0.221> - SER (behind a Cisco 3600 so ALG rewrote 
> the IPs)
> 69.36.46.178 <http://69.36.46.178> - NATed SIP UA
> 
> U 2005/04/15 02:19:16.252614 69.35.46.178:5060 <http://69.35.46.178:5060>-> 
> 10.3.0.221:5060 <http://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 <http://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 <http://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 <http://192.168.1.102>.
> s=-.
> c=IN IP4 192.168.1.102 <http://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 <http://10.3.0.221:5060> -> 
> 69.35.46.178:5060 <http://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 <http://192.168.1.102:5060>
> ;branch=z9hG4bK3915905414;rport=5060;received=69.35.46.178<http://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 <http://69.35.46.178:5060>-> 
> 10.3.0.221:5060 <http://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 <http://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 <http://10.3.0.221:5060> -> 
> 10.3.0.221:5060 <http://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 <http://10.3.0.221>;ftag=1465261089;lr>.
> Via: SIP/2.0/UDP 10.3.0.221 <http://10.3.0.221>;branch=0.
> Via: SIP/2.0/UDP 192.168.1.102:5060 <http://192.168.1.102:5060>;received=
> 69.35.46.178 <http://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.
>  
> _______________________________________________
> Serusers mailing list
> serusers at lists.iptel.org
> http://lists.iptel.org/mailman/listinfo/serusers
> 
> 
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.sip-router.org/pipermail/sr-users/attachments/20050415/97dda466/attachment.htm>