<div><b>Please find comments after each step</b></div><div><br><br><div class="gmail_quote">On Wed, Sep 19, 2012 at 9:06 AM, Jon Bonilla <span dir="ltr"><<a href="mailto:jbonilla@sipwise.com" target="_blank">jbonilla@sipwise.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">El Wed, 19 Sep 2012 17:47:35 +0200<br>
Imanol Pardavila <<a href="mailto:imanol.pardavila@ibercom.com">imanol.pardavila@ibercom.com</a>> escribió:<br>
<div class="im"><br>
> Hi,<br>
> I've just started testing sip:provider CE, and I have my first question.<br>
> When I try making a transfer for my endpoint, I get a Forbidden message.<br>
> As I can see in the pcap file, it seems that sip:provider CE doesn't<br>
> allow REFER method. Can it be enabled on any config file?<br>
> Thanks<br>
> Imanol<br>
<br>
<br>
</div>You can enable it if you want. It's disabled by default to avoid fraud as if<br>
the refer is forwarded to your pstn gws and they accept that method, customers<br>
can receive a local call, be transferred to an international destination and<br>
the peer gw owner pays the bill. Be careful with enabling REFER method!<br>
<br>
What can you do to enable it:<br>
<br>
- First, you'll need to enable the method itself in the proxy configuration<br>
using a customtt template. In kamailio.cfg file add it to the list of allowed<br>
methods:<br>
<br>
-if(is_method("INVITE|ACK|CANCEL|BYE|OPTIONS|PRACK|UPDATE"))<br>
+if(is_method("INVITE|ACK|CANCEL|BYE|OPTIONS|PRACK|UPDATE|REFER"))<br>
<br>
That would be enough for the proxy as REFER is only sent in-dialog and no<br>
further confguration would be needed.<br>
<br></blockquote><div><br></div><div><b>This one worked fine</b></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
- The second part is that you need to whitelist some headers in sems sbc in<br>
order REFER to work. Sems has a list of allowed headers and removes the rest.<br>
In ngcp.sbcprofile.conf you could disable header filtering or add the needed<br>
headers to the whitelist:<br>
<br>
-header_list=P-D-Uri,P-Preferred-Identity,P-Asserted-Identity,Privacy,Allow,Supported,P-Out-Socket[%<br>
IF kamailio.proxy.presence.enable == "yes"<br>
%],Event,Expires,Subscription-State,Accept[% END %]<br>
<br>
+header_list=P-D-Uri,P-Preferred-Identity,P-Asserted-Identity,Privacy,Allow,Supported,P-Out-Socket[%<br>
IF kamailio.proxy.presence.enable == "yes"<br>
%]Expires,Accept[% END %], Refer-To, Subscription-State, Event<br></blockquote><div><br></div><div><b>I change this one like this and it still did not work, looked like some commas were missing</b></div><div><b><br></b></div>
<div><b>header_list=P-D-Uri,P-Preferred-Identity,P-Asserted-Identity,Privacy,Allow,Supported,P-Out-Socket[% IF kamailio.proxy.presence.enable == "yes" %],Expires,Accept[% END %],Refer-To,Subscription-State,Event</b></div>
<div><b><br></b></div><div><b>It gave me 500 server errors</b></div><div><b><br></b></div><div><b><br></b></div><div><b>Could you please let me know how to disable filtering all together?</b></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
That should be enough. This has be written without checking so I don't warranty<br>
the result. Maybe I forgot some headers but a ngrep capture could help you<br>
dealing with that.<br>
<br>
I also don't know the result or impact of the billing process when a call is<br>
ended due a REFER.<br>
<br>
And please, take in consideration the security risks before enabling this<br>
method. Make sure your gws don't allow REFER.<br>
<br>
<br>
<br>
cheers,<br>
<br>
Jon<br>
<br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div>-- </div><div>Ali S Ardestani </div><div>Telephony Systems Engineer</div><div>Private National Mortgage Acceptance Company (PennyMac)</div><div>6101 Condor Drive</div>
<div>Moorpark, CA 93021</div><div><br></div><div>(805) 330-6004 Office</div><div>(818) 224-7442 x2654 Office</div><div>(626) 817-3512 Mobile</div><div>(818) 224-7397 Fax</div><div><br></div><div><a href="mailto:ali.ardestani@pnmac.com" target="_blank">ali.ardestani@pnmac.com</a></div>
<br>
</div>