New subject: [Serusers] 483 - Too many hops

24 Jun 2003

      (you forgot to CC the mailing list)
a possibility is that the contacts you registered cause a loop.
andy
At 06:22 PM 6/24/2003, Chintan Thakker wrote:
...
Hi,
Seems I missed something, I am sending INVITE to sip:9727610001@192.1.2.17 with Route: sip:192.1.2.17;lr to the proxy server ('ser') running on 192.1.2.17 and getting 483 - too many hops message. I modified ser.conf to add alias = "192.1.2.17" but it still gives me the same problem.
What am I missing out ?. I guess an 'alias=192.1.2.17' entry should return a true to 'uri==myself' matching performed in the script and make the server process that request rather than forwarding it (to itself in this case)
Thanks,
Chintan
-- ser.cfg --
1 #
    2 # $Id: ser.cfg,v 1.20 2003/05/31 21:12:19 jiri Exp $
    3 #
    4 # simple quick-start config script
    5 #
    6
    7 # ----------- global configuration parameters ------------------------
    8
    9 debug=3         # debug level (cmd line: -dddddddddd)
   10 fork=yes
   11 log_stderror=no # (cmd line: -E)
   12
   13 /* Uncomment these lines to enter debugging mode
   14 debug=7
   15 fork=no
   16 log_stderror=yes
   17 */
   18
   19 check_via=no    # (cmd. line: -v)
   20 dns=no           # (cmd. line: -r)
   21 rev_dns=no      # (cmd. line: -R)
   22 port=5060
   23 children=4
   24 fifo="/tmp/ser_fifo"
   25
   26 # ------------------ module loading ----------------------------------
   27
   28 # Uncomment this if you want to use SQL database
   29 #loadmodule "/usr/local/lib/ser/modules/mysql.so"
   30
   31 loadmodule "/usr/local/lib/ser/modules/sl.so"
   32 loadmodule "/usr/local/lib/ser/modules/tm.so"
   33 loadmodule "/usr/local/lib/ser/modules/rr.so"
   34 loadmodule "/usr/local/lib/ser/modules/maxfwd.so"
   35 loadmodule "/usr/local/lib/ser/modules/usrloc.so"
   36 loadmodule "/usr/local/lib/ser/modules/registrar.so"
   37
   38 # Uncomment this if you want digest authentication
   39 # mysql.so must be loaded !
   40 #loadmodule "/usr/local/lib/ser/modules/auth.so"
   41 #loadmodule "/usr/local/lib/ser/modules/auth_db.so"
   42
   43 # ----------------- setting module-specific parameters ---------------
   44
   45 # -- usrloc params --
   46
   47 modparam("usrloc", "db_mode",   0)
   48
   49 # Uncomment this if you want to use SQL database
   50 # for persistent storage and comment the previous line
   51 #modparam("usrloc", "db_mode", 2)
   52
  53 # -- auth params --
   54 # Uncomment if you are using auth module
   55 #
   56 #modparam("auth_db", "calculate_ha1", yes)
   57 #
   58 # If you set "calculate_ha1" parameter to yes (which true in this config),
   59 # uncomment also the following parameter)
   60 #
   61 #modparam("auth_db", "password_column", "password")
   62
   63 # -------------------------  request routing logic -------------------
   64
   65 #add aliases
   66 alias="192.1.2.17"
   67
   68 # main routing logic
   69
   70 route{
   71
   72         # initial sanity checks -- messages with
   73         # max_forwards==0, or excessively long requests
   74         if (!mf_process_maxfwd_header("10")) {
   75                 sl_send_reply("483","Too Many Hops");
   76                 break;
   77         };
   78         if (len_gt( max_len )) {
   79                 sl_send_reply("513", "Message too big");
   80                 break;
   81         };
   82
   83         # we record-route all messages -- to make sure that
   84         # subsequent messages will go through our proxy; that's
   85         # particularly good if upstream and downstream entities
   86         # use different transport protocol
   87         record_route();
   88         # loose-route processing
   89         if (loose_route()) {
   90                 t_relay();
   91                 break;
   92         };
   93
   94         # if the request is for other domain use UsrLoc
   95         # (in case, it does not work, use the following command
   96         # with proper names and addresses in it)
   97         if (uri==myself) {
   98
   99                 if (method=="REGISTER") {
  100
  101 # Uncomment this if you want to use digest authentication
  102 #                       if (!www_authorize("iptel.org", "subscriber")) {
  103 #                               www_challenge("iptel.org", "0");
53,1          65%
 104 #                               break;
  105 #                       };
  106
  107                         save("location");
  108                         break;
  109                 };
  110
  111                 # native SIP destinations are handled using our USRLOC DB
  112                 if (!lookup("location")) {
  113                         sl_send_reply("404", "Not Found");
  114                         break;
  115                 };
  116         };
  117         #Let tje server [rpcess tje cirremt reqiest
  118         #if(uri =~ "^sip:(.+@)?(192.1.2.17)([:;?].*)?$" )
  119         #{
  120         #       break;
  121         #};
  122
  123         # forward to current uri now; use stateful forwarding; that
  124         # works reliably even if we forward from TCP to UDP
  125         if (!t_relay()) {
  126                 sl_reply_error();
  127         };
  128
  129 }
  130

end ser.cfg --

Andy Blen wrote:
...
most likely a misconfig issue on your side, feel free to read the doc, http://www.iptel.org/ser/doc/prerelease/x1026.html#AEN1032
andy
At 12:18 AM 6/21/2003, Chintan Thakker wrote:
...
Hi,
Consider the following scenario. UA1 is trying to call UA2 both registered with the same proxy. (UA1 -> 'ser' -> UA2)

UA1 sends INVITE to the proxy with request uri set to UA2. It also sets the Route header in the invite to that of the proxy.
This returns a 483 - too many hops to UA1
It seems that in the above mentioned scenario, the proxy loops back the INVITE multiple times locally. This decrements the Max Forwards value every time until it becomes zero and hence sends 483 back to UA1. It seems to me this is not the correct behavior of the server. It should forward the request to UA2.
Thanks in advance,
Chintan
-- Start trace --
U 2003/06/20 15:24:42.362466 192.1.2.88:5060 -> 192.1.2.17:5060
INVITE sip:9727610001@192.1.2.17 SIP/2.0.Via: SIP/2.0/UDP 192.1.2.88:5060;b
ranch=z9hG4bK421668676.Max-Forwards: 70.From: 9727619271 sip:9727619271@19
2.1.2.88;tag=421668676.To: 9727610001 sip:9727610001@192.1.2.17.Call-ID:
421668676@192.1.2.88.CSeq: 1 INVITE.Contact: sip:9727619271@192.1.2.88.C
ontent-Type: application/sdp.Content-Length: 138.Route: sip:192.1.2.17;lr
..v=0.o=username 421668676 421668676 IN IP4 192.1.2.88.s=Session SDP.c=IN I
P4 192.1.2.88.t=0 0.m=audio 54454 RTP/AVP 0.a=rtpmap:0 PCMU/8000.
U 2003/06/20 15:24:42.363813 192.1.2.17:5060 -> 192.1.2.88:5060
SIP/2.0 100 trying -- your call is important to us..Via: SIP/2.0/UDP 192.1.
2.88:5060;branch=z9hG4bK421668676..From: 9727619271 sip:9727619271@192.1.2
.88;tag=421668676.To: 9727610001 sip:9727610001@192.1.2.17.Call-ID: 4216
68676@192.1.2.88.CSeq: 1 INVITE.Server: Sip EXpress router (0.8.11pre29 (i3
86/linux))..Content-Length: 0..Warning: 392 192.1.2.17:5060 "Noisy feedback
tells:  pid=15107 req_src_ip=192.1.2.88 req_src_port=5060 in_uri=sip:97276
10001@192.1.2.17 out_uri=sip:9727610001@192.1.2.17 via_cnt==1"....
#
U 2003/06/20 15:24:42.794681 192.1.2.17:5060 -> 192.1.2.88:5060
SIP/2.0 483 Too Many Hops..Via: SIP/2.0/UDP 192.1.2.88:5060;branch=z9hG4bK4
21668676..From: 9727619271 sip:9727619271@192.1.2.88;tag=421668676.To: 97
27610001 sip:9727610001@192.1.2.17;tag=b27e1a1d33761e85846fc98f5f3a7e58.4
632.Call-ID: 421668676@192.1.2.88.CSeq: 1 INVITE.Server: Sip EXpress router
(0.8.11pre29 (i386/linux))..Content-Length: 0..Warning: 392 192.1.2.17:506
0 "Noisy feedback tells:  pid=15107 req_src_ip=192.1.2.17 req_src_port=5060
in_uri=sip:9727610001@192.1.2.17 out_uri=sip:9727610001@192.1.2.17 via_cnt
==71"....
-- End trace --
ps: We checked it with loose routing(suceeding ';lr' present in URIs in Route) as well as strict routing(suceeding ';lr' not present in URIs in Route). Should the type of routing used matter ?

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--
Andy Blen
iptel.org Services
--
Andy Blen
iptel.org Services

Re: [Serusers] 483 - Too many hops