[Users] pstn-to-openser, 403 Forbiden

[Norman Brandinger]

Hello Ion,

Perhaps the "pstn" device is not responding to the authorization 
request.  A SIP trace will show you if this is happening.

"ngrep -W byline port 5060" should be all you need to trace SIP messages 
(if you're listening on eth1, then you might want to add "-d eth1" when 
invoking ngrep).  Older versions of ngrep did not have the "-W byline" 
option.  If this is your case, you probably should upgrade ngrep.

A possible solution to you problem might be to use the "permissions" 
module and the "trusted" table.  Then, instead of 
(www_authorize/www_challenge or in addition to, depending on your 
particular situation) you might want to use the "allow_trusted()" 
command to authenticate incoming INVITEs.

Below is a little example

<snip>

     if (!is_from_local() && !allow_trusted()) {
       if (!proxy_authorize("","subscriber")) {
         proxy_challenge("","0");
         exit;
       } else if (!check_from()) {
         sl_send_reply("403", "Use From=ID");
         exit;
       };
     };

</snip>

Regards,
Norm

Ion Minzu wrote:
> Hello ,
>
> I have connected openser with pstn through cisco. when I make a call from voip network to pstn it's ok.
> but from pstn to voip I have a problem:openser answers 403 forbiden.
> in openser I do the authorisation on mysql, I have disabled authorisation on sip
> gateway:
>
> if (src_ip!=X.X.X.X) {
>         if (!www_authorize("DOMAIN.COM","subscriber")) {
>         www_challenge("DOMAIN.COM","0");
>         exit;
>         }
>         };
>
> What is the problem?
>
>  X.X.X.X is cisco
>  
> U X.X.X.X:54177 -> 172.17.6.2:5060
>   INVITE sip:820022 at 172.17.6.2:5060 SIP/2.0..Via: SIP/2.0/UDP
>   X.X.X.X:5060..From: <sip:022250699 at X.X.X.X>;tag=1A0FBC30-1472..To: <sip:820022 at 172.1
>   7.6.2>..Date: Wed, 08 Nov 2006 11:03:14 GMT..Call-ID:
>   906DA628-6E4F11DB-9034EA4F-E981BA1F at X.X.X.X..Supported: timer,100rel..Min-SE:  1800..Cisco-Guid
>   : 2422905184-1850675675-2419190351-3917593119..User-Agent: Cisco-SIPGateway/IOS-12.x..Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBS
>   CRIBE, NOTIFY, INFO..CSeq: 101 INVITE..Max-Forwards: 6..Remote-Party-ID: <sip:022250699 at X.X.X.X>;party=calling;screen=yes;privacy=off..Timestamp: 116
>   2983794..Contact: <sip:022250699 at X.X.X.X:5060>..Expires: 180..Allow-Events: telephone-event..Content-Type: application/sdp..Content-Length: 235....v=
>   0..o=CiscoSystemsSIP-GW-UserAgent 1226 5023 IN IP4 X.X.X.X..s=SIP
>   Call..c=IN IP4 X.X.X.X..t=0 0..m=audio 16642 RTP/AVP 18 19..c=IN IP4
>   X.X.X.X..a=rtpmap:18 G729/8000..a=fmtp:18 annexb=no..a=rtpmap:19 CN/8000..a=ptime:20..
> #
> U 172.17.6.2:5060 -> X.X.X.X:5060
>   SIP/2.0 403 Use From=ID..Via: SIP/2.0/UDP  X.X.X.X:5060..From:
>   <sip:022250699 at X.X.X.X>;tag=1A0FBC30-1472..To:
>   <sip:820022 at 172.17.6.2>;tag=329cfeaa6ded039da25ff8cbb8668bd2.13ec..Call-ID: 906DA628-6E4F11DB-9034EA4F-E981BA1F at X.X.X.X..CSeq: 101 INVITE..Server: OpenSer (1.1.0-tls (x86_64/linux))..C
>   ontent-Length: 0..Warning: 392 172.17.6.2:5060 "Noisy feedback tells:  pid=32240 req_src_ip=X.X.X.X req_src_port=54177 in_uri=sip:820022 at 172.17.6.2:5
>   060 out_uri=sip:820022 at 172.17.6.2:5060 via_cnt==1"....
> #
> U X.X.X.X:54177 -> 172.17.6.2:5060
>   ACK sip:820022 at 172.17.6.2:5060 SIP/2.0..Via: SIP/2.0/UDP
>   X.X.X.X:5060..From: <sip:022250699 at X.X.X.X>;tag=1A0FBC30-1472..To: <sip:820022 at 172.17.6
>   .2>;tag=329cfeaa6ded039da25ff8cbb8668bd2.13ec..Date: Wed, 08 Nov
>   2006 11:03:14 GMT..Call-ID:
>   906DA628-6E4F11DB-9034EA4F-E981BA1F at X.X.X.X..Max-Forward
>   s: 6..Content-Length: 0..CSeq: 101 ACK....
>
>
> Best regards,
> Ion Minzu,
> Specialist Tehnologii Informationale,
> Administrator de sistem al Centrului de certificare,
> Administrator VoIP,
> I.S."Centrul de Telecomunicatii Speciale",
> tel:250-517 (office), 069501208 (mob), 382869185 (ICQ)
> mailto:ion.minzu at cts.md
>
>
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