[Serusers] NAT problems using netopia router but not cisco routers in REGISTER method

Fri Oct 15 07:02:42 CEST 2004

I am trying to register a Sipura ATA to ser. I am using nathelper to fix 
contact in the register method. Probably Iam implementing nathelper in 
the wrong way but it works with a cisco router but not with a netopia or 
linksys router. I append SIP traces. Please help me!

        if (method=="REGISTER") {

               if (nat_uac_test("2")) {
                       log(1, "Se detecta cliente con NAT src address 
different than via header\n");
                       fix_nated_contact();
                      append_hf("P-hint: fixed NAT contact for 
request\r\n");

               };

                if (!www_authorize("65.77.23.7", "subscriber")) {
                        www_challenge("65.77.23.7", "0");
                        break;
                };

        save("location");
                        break;
        };

The following trace is taken when the Sipura is using a netopia router. 
Sipura has IP address 192.168.1.50 and the public Ip address is 
200.52.114.200. These messages are repeated too many times,  I have the 
following question:

* In the VIA header I see that Sipura is sending private IP address not 
public. Is that correct? Can I solve it using nathelper?

U 200.52.114.200:49174 -> 65.77.23.7:5060
  REGISTER sip:ser.transtelco.com.mx SIP/2.0..Via: SIP/2.0/UDP 
192.168.1.50:5060;branch=z9hG4bK-62ae5363..From: 915534820
  0 <sip:9155348200 at ser.transtelco.com.mx>;tag=72c2198bafad6ea5..To: 
9155348200 <sip:9155348200 at ser.transtelco.com.mx>..C
  all-ID: e38c8da3-fe5bc96d at 192.168.1.50..CSeq: 19 
REGISTER..Max-Forwards: 70..Contact: 9155348200 <sip:9155348200 at 192.16
  8.1.50:5060>;expires=3600..User-Agent: 
Sipura/SPA2000-2.0.7(f)..Content-Length: 0..Allow: ACK, BYE, CANCEL, 
INFO, INVIT
  E, NOTIFY, OPTIONS, REFER..Supported: x-sipura....
#
U 65.77.23.7:5060 -> 200.52.114.200:5060
  SIP/2.0 401 Unauthorized..Via: SIP/2.0/UDP 
192.168.1.50:5060;branch=z9hG4bK-62ae5363;received=200.52.114.200..From: 915
  5348200 
<sip:9155348200 at ser.transtelco.com.mx>;tag=72c2198bafad6ea5..To: 
9155348200 <sip:9155348200 at ser.transtelco.com.
  mx>;tag=b27e1a1d33761e85846fc98f5f3a7e58.44b5..Call-ID: 
e38c8da3-fe5bc96d at 192.168.1.50..CSeq: 19 REGISTER..WWW-Authenti
  cate: Digest realm="65.77.23.7", 
nonce="416f3a1843fa3327f66e89ac738fff54f5842d41"..Server: Sip EXpress 
router (0.8.99-d
  ev10 (i386/linux))..Content-Length: 0..Warning: 392 65.77.23.7:5060 
"Noisy feedback tells:  pid=1864 req_src_ip=200.52.
  114.200 req_src_port=49174 in_uri=sip:ser.transtelco.com.mx 
out_uri=sip:ser.transtelco.com.mx via_cnt==1"....

This trace is taken from a Cisco router. When I use this router I do not 
have any problems with regitration. VIA haeders are correct. I would 
like to know if using nathelper can I solve the problem when there is a 
UA behind netopia or similar router?

U 200.52.114.47:5060 -> 65.77.23.7:5060
  REGISTER sip:ser.transtelco.com.mx SIP/2.0..Via: SIP/2.0/UDP 
200.52.114.47:1199;branch=z9hG4bK-fc8090f5..From: 91553482
  00 <sip:9155348200 at ser.transtelco.com.mx>;tag=dd7e91a3ab719570..To: 
9155348200 <sip:9155348200 at ser.transtelco.com.mx>..
  Call-ID: 9822f6af-701b93d4 at 192.168.1.50..CSeq: 1 
REGISTER..Max-Forwards: 70..Contact: 9155348200 <sip:9155348200 at 200.52
  .114.47:1199>;expires=3600..User-Agent: 
Sipura/SPA2000-2.0.7(f)..Content-Length: 0..Allow: ACK, BYE, CANCEL, 
INFO, INVI
  TE, NOTIFY, OPTIONS, REFER..Supported: x-sipura....
#
U 65.77.23.7:5060 -> 200.52.114.47:1199
  SIP/2.0 401 Unauthorized..Via: SIP/2.0/UDP 
200.52.114.47:1199;branch=z9hG4bK-fc8090f5..From: 9155348200 <sip:9155348200
  @ser.transtelco.com.mx>;tag=dd7e91a3ab719570..To: 9155348200 
<sip:9155348200 at ser.transtelco.com.mx>;tag=b27e1a1d33761e8
  5846fc98f5f3a7e58.54fb..Call-ID: 9822f6af-701b93d4 at 192.168.1.50..CSeq: 
1 REGISTER..WWW-Authenticate: Digest realm="65.7
  7.23.7", nonce="416f3af0550c9a868bfcf2f00543c882422c96c3"..Server: Sip 
EXpress router (0.8.99-dev10 (i386/linux))..Cont
  ent-Length: 0..Warning: 392 65.77.23.7:5060 "Noisy feedback tells:  
pid=1882 req_src_ip=200.52.114.47 req_src_port=5060
   in_uri=sip:ser.transtelco.com.mx out_uri=sip:ser.transtelco.com.mx 
via_cnt==1"....
#
U 200.52.114.47:1199 -> 65.77.23.7:5060
  REGISTER sip:ser.transtelco.com.mx SIP/2.0..Via: SIP/2.0/UDP 
200.52.114.47:5060;branch=z9hG4bK-c0d8c0ed..From: 91553482
  00 <sip:9155348200 at ser.transtelco.com.mx>;tag=dd7e91a3ab719570..To: 
9155348200 <sip:9155348200 at ser.transtelco.com.mx>..
  Call-ID: 9822f6af-701b93d4 at 192.168.1.50..CSeq: 2 
REGISTER..Max-Forwards: 70..Authorization: Digest username="9155348200

",realm="65.77.23.7",nonce="416f3af0550c9a868bfcf2f00543c882422c96c3",uri="sip:9155348200 at ser.transtelco.com.mx",algori
  thm=MD5,response="1a1164b79300476badb8832b86a0ec27"..Contact: 
9155348200 <sip:9155348200 at 200.52.114.47:5060>;expires=36
  00..User-Agent: Sipura/SPA2000-2.0.7(f)..Content-Length: 0..Allow: 
ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REF
  ER..Supported: x-sipura....
#
U 65.77.23.7:5060 -> 200.52.114.47:5060
  SIP/2.0 200 OK..Via: SIP/2.0/UDP 
200.52.114.47:5060;branch=z9hG4bK-c0d8c0ed..From: 9155348200 
<sip:9155348200 at ser.trans
  telco.com.mx>;tag=dd7e91a3ab719570..To: 9155348200 
<sip:9155348200 at ser.transtelco.com.mx>;tag=b27e1a1d33761e85846fc98f5
  f3a7e58.16ad..Call-ID: 9822f6af-701b93d4 at 192.168.1.50..CSeq: 2 
REGISTER..Contact: <sip:9155348200 at 200.52.114.47:5060>;e
  xpires=2245, <sip:9155348200 at 200.52.114.47:1199>;expires=3600..Server: 
Sip EXpress router (0.8.99-dev10 (i386/linux))..
  Content-Length: 0..Warning: 392 65.77.23.7:5060 "Noisy feedback 
tells:  pid=1873 req_src_ip=200.52.114.47 req_src_port=
  1199 in_uri=sip:ser.transtelco.com.mx 
out_uri=sip:ser.transtelco.com.mx via_cnt==1"....