[OpenSIPS-Users] Engage media proxy corrupts sdp c= when dynamic routing

[Brian ipt]

On Fri, Feb 10, 2012 at 10:01 PM, Charles Solar <charlessolar at gmail.com>wrote:

> Definitely not - I know there was a lengthy discussion about calling
> use_media_proxy twice and that function a while ago.  The only thing I do
> with a natted invite is this:
>
> # NAT test
>         if( is_method("INVITE") && !has_totag() )
>         {
>                 $avp(can_uri) = $ru;
>
>                 setflag(3); # flag for NAT
>                 force_rport();
>                 fix_contact();
>                 append_hf("P-hint: NAT\r\n");
>                 xlog( "L_INFO", "Engaging media proxy" );
>                 engage_media_proxy();
>         }
>
> Charles
>
>
Sorry not to be more helpful and you as you say in your mail it does look
like a bug, engage_media_proxy is using dialog and when you failover
mediaproxy module is modifying SDP incorrectly for the second time..

use use_media_proxy and end_media_sessions to get around this for the
moment.



>
> On Fri, Feb 10, 2012 at 3:54 PM, Brian ipt <voiplists at iptel.co> wrote:
>
>>
>>
>> On Fri, Feb 10, 2012 at 9:21 PM, Charles Solar <charlessolar at gmail.com>wrote:
>>
>>> I have been using engage_media_proxy in my script, but it seems to cause
>>> problems when I failover in the dynamic routing module.
>>> This is the scenario:
>>>
>>> 1. Incoming call
>>> 2. Engage media proxy
>>> 3. Try first GW (which is down)
>>> 4. Failure route
>>> 5. Try next GW
>>> 6. Next GW sends Session progress & invite
>>> 7. Media proxy module 'fixes' my SDP contact twice
>>>
>>> My SIP message end up with duplicated SDP contact info.  For example:c=IN IP4 33.66.22.1133.66.22.11
>>>
>>> If the first gateway works, this does not happen.  In fact it works
>>> perfectly.  But I guess engage_media_proxy or the dialog module is having
>>> an issue with a failure scenario?
>>>
>>> My failure route is pretty simple:
>>>
>>> failure_route[4] {
>>>         xlog("L_INFO", "Failure Route: $rm,  $fu,  $ru\n");
>>>
>>>         if (use_next_gw()) {
>>>                 xlog("L_INFO", "Trying next gateway" );
>>>                 t_relay();
>>>                 exit;
>>>         } else {
>>>                 xlog( "L_INFO", "Exhausted gateway list" );
>>>                 t_reply ("503", "Service not available");
>>>                 exit;
>>>         }
>>> }
>>>
>>> Should I switch to use_media_proxy/end_media_session if I want to expect
>>> failovers?  Or could I be doing something wrong?
>>>
>>> Thanks guys
>>> Charles
>>>
>>
>>
>>
>> Hi Charles,
>>
>> Are you using fix_nated_sdp anywhere in your scripts or using anything
>> else that modifies the SDP?
>>
>> Brian
>>
>>
>>
>>>
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>>
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>
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