[sr-dev] avp and topoh questions

[Daniel-Constantin Mierla]

Hello,

the avps are not available when the callbacks used by topos are executed.

An option would be to store in a hash table using from-tag/call-id as a key (requiring to bind to htable, ...).

The alternative, if you will develop a solution that requires to mark only the initial request, could be to add a custom header in request_route, then match it in the topos callback when the request is sent out and remove the header.

Cheers,
Daniel

March 23, 2017 2:50 PM, "Paul Claudiu Boriga" <paul.boriga at 1and1.ro> wrote:

> Hello all,
> 
> My name is Claudiu and I am a new developer in the 1&1 team, also new to 
> SIP and Kamailio.
> 
> I am having some issues trying to change the way topoh module works, 
> could you help me with some avp and topoh related issues?
> 
> The idea is to modify how the topoh module works by introducing a per 
> message/transaction parameter to mark which messages/transactions should 
> be hidden. I am using an avp parameter, which I define in the config 
> like this: "modparam("topoh","hide_avp", "$avp(hide)")"
> and later use as this "$avp(hide)=1;". I intend to modify the 
> th_msg_sent and th_msg_received, to read the value of the avp, using 
> "search_first_avp" function, and only mask the headears if the avp is set.
> These functions are registered as callbacks for the SREV_NET_DATA_IN and 
> SREV_NET_DATA_OUT events:
> sr_event_register_cb(SREV_NET_DATA_IN, th_msg_received);
> sr_event_register_cb(SREV_NET_DATA_OUT, th_msg_sent);
> I encountered the following issues:
> - apparently the avp is never seen as being set in the th_msg_received 
> function, even though if I print in from the config with xlog, it 
> appears to be set.
> - for some messages (180 ringing, and 200 ok), the avp is not seen as 
> set in the th_msg_sent, but is seen on other requests (invite,bye) and 
> replies (100 trying) messages. If I print it with xlog form config, on 
> the onreply_route is appears set.
> 
> Is the function th_msg_received always called before avps are seen in 
> the code?
> Any idea why for the 180 and 200 messages the avp is not seen in the 
> code inside th_msg_sent function?
> 
> Thanks and regards,
> Claudiu Boriga
> 
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--
Daniel-Constantin Mierla
www.kamailio.org -- www.asipto.com