Re: [Users] multiple 487 created - sr-users

16 Feb 2006

Hi,

 I am using the features-callfwd.5.0.cfg from onsip
(configs.GettingStarted.tar.gz).  I have taken a callflow for the
message as below.
http://meerkat.no-ip.com/openser/feature-forward_index.html
In frame 17, a cancel is created.  From frame 22 to 29, a serier of
487 and ACK is created.  After a few seconds, 487 is generated in
frame 50.  And then you can still see 487 later.

Just want to ask it is the normal situation for openser to generate so
much 487?  As I am using mediaproxy for NAT.  Does it cause that
problem?

unplug

On 2/15/06, Klaus Darilion &lt;klaus.mailinglists(a)pernau.at&gt; wrote:
...
  Hi!

 I'm not sure, but the ACK has a different branch parameter in the Via
 header, than the CANCEL and INVITE. I guess this will cause that openser
 wont find the corresponding transaction

 klaus

 On Wed, February 15, 2006 11:16, unplug said:
  Thanks!  But I don't really understand why
there is a mismatch between
 487and ACK.  Below is a part of sip message pair of 487 and ACK.

 Below is the complete log from ngrep.  (From line 290, openser creates
 487 and line 304 UA1 ACK.  After that, multiple 487 are created by
 openser)
 http://meerkat.no-ip.com/openser/cancel_normal.log

 Below is my openser.cfg for reference
 http://meerkat.no-ip.com/openser/openser.cfg

 290 U 203.193.26.226:5060 -> 210.184.23.31:5060
 291 SIP/2.0 487 Request Cancelled.
 292 Via: SIP/2.0/UDP
 10.0.0.46:5060;rport=5060;received=210.184.23.31;branch=z9hG4bKdUyOnG9Zel82UECI.
 293 From:

"sip:36418488@o01.ol.com"<sip:871966806561@o01.ol.com>;tag=xLTdFs7yGkeXq3wn.
 294 To: "34163634" <sip:34163634@o01.ol.com>;tag=A81AFED4-21D7.
 295 Date: Tue, 15 Feb 2005 01:52:57 GMT.
 296 Call-ID: Z0wcK4WwdTU6mH00(a)10.0.0.46.
 297 Server: Cisco-SIPGateway/IOS-12.x.
 298 CSeq: 1 INVITE.
 299 Allow-Events: telephone-event.
 300 Content-Length: 0.
 301 .
 302
 303 #
 304 U 210.184.23.31:5060 -> 203.193.26.226:5060
 305 ACK sip:34163634@o01.ol.com SIP/2.0.
 306 Via: SIP/2.0/UDP 10.0.0.46:5060;branch=z9hG4bKdUyOnG9Zel82UECI.
 307 Route:
 <sip:34163634@203.193.26.226:5060;nat=yes;ftag=xLTdFs7yGkeXq3wn;lr=on>.
 308 Max-Forwards: 70.
 309 User-Agent: Koncept KE10XX v4.32.10 00-09-45-0a-fc-2d.
 310 From: "871966806561"
 <sip:871966806561@o01.ol.com>;tag=xLTdFs7yGkeXq3wn.
 311 To: "34163634" <sip:34163634@o01.ol.com>;tag=A81AFED4-21D7.
 312 Call-ID: Z0wcK4WwdTU6mH00(a)10.0.0.46.
 313 Contact: <sip:871966806561@10.0.0.46:5060>.
 314 CSeq: 1 ACK.
 315 Content-Length: 0.

 In my openser.cfg line 184-187, it is remarked.  Do you mean it should
 un-remarked for handling ACK according to your point 2?

 On 2/15/06, Klaus Darilion &lt;klaus.mailinglists(a)pernau.at&gt; wrote:
  This means that openser does not receive the ACK
or is not able to match
 the ACK to the canceled transaction. Thus it is re-transmitting the 487.

 Increas the debug level and take a look at the syslog to find out if:
 1. the ACK to the 487 is received by openser
 2. if it is received, check if there is a problem during handling of the
 ACK. (for these kind of ACKs just t_relay()).

 klaus

 On Wed, February 15, 2006 5:13, unplug said:
  For the normal cancel situation.

 UA1           OPENSER         UA2
 --------INVITE----------------->
 <-----------100-----------------
                   --------------------INVITE---------->
                   <---------------100-------------------
 ----------CANCEL---------->
                   --------------CANCEL------------->
                  <--------------200------------------
                 <------------487-------------------
                  --------------ACK----------------->
 <---------487---------------
 -------------ACK------------>

 But in my case, I found that there are many 487 created from openser
 to UA1.  The multiple 487 may cause a call drop in the following call.
  Why does openser create so many 487 for UA1?  How can I prevent it?

 UA1           OPENSER         UA2
 --------INVITE----------------->
 <-----------100-----------------
                   --------------------INVITE---------->
                   <---------------100-------------------
 ----------CANCEL---------->
                   --------------CANCEL------------->
                  <--------------200------------------
                 <------------487-------------------
                  --------------ACK----------------->
 <---------487---------------
 -------------ACK------------>
 <---------487-------------
 -------------ACK------------>
 <---------487---------------
 -------------ACK------------>
 <---------487-------------
 -------------ACK------------>
 <---------487-------------
 -------------ACK------------>
 <---------487-------------
 -------------ACK------------>
 <---------487-------------
 -------------ACK------------>
 ...

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