[SR-Users] Parsing Contact Port Field

[Henning Westerholt]

Hello Alex,

this was one of the topics we discussed (in general terms) last week in our development meeting.

No decision to deprecate the select framework has been done so far. You are right in noticing that the pseudo-variables are more used and also frequently extended, the select framework does not get extended since some time. But bugs that are reported in this area should be fixed as well.

Before deprecating the selects, a review needs to be done if the functionality can be completely replaced by PVs/transformations, some migration guide would be probably also necessary.

You are somehow wrong about the documentation, it is also in the wiki, but documented without much explanations. 😉

https://www.kamailio.org/wiki/cookbooks/devel/selects

Cheers,

Henning

--
Henning Westerholt – https://skalatan.de/blog/
Kamailio services – https://gilawa.com<https://gilawa.com/>
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From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of Alex Balashov
Sent: Monday, November 18, 2019 2:37 PM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Subject: Re: [SR-Users] Parsing Contact Port Field

Just be careful with selects as they are a construct imported from SER as part of the sip-router integration of 2010 (what a fascinating time to have been alive!)

Like some other SER constructs, they are not widely used and so I am not sure what the maintenance and support commitment to them is on a go-forward basis. I’m not saying it’s not there or that nobody uses selects—others can clarify—but it’s notable that they are not in the core docs (as far as I know). For trivial operations which do not require the more extensive and nuanced flexibility of selects, you might consider a more “Kamailio-native” way: transformations.

https://www.kamailio.org/wiki/cookbooks/5.3.x/transformations#urihost

That is to say:

  $(ct{uri.host})

— Alex

—
Sent from mobile, with due apologies for brevity and errors.


On Nov 18, 2019, at 8:27 AM, Michael Iedema <michael at kapsulate.com<mailto:michael at kapsulate.com>> wrote:
Hi Sergiu,


@contact.uri.hostport might be what you are looking for.

For more:
http://www.kamailio.org/wiki/cookbooks/devel/selects


That worked perfectly, thanks!

For the other beginners out there, here are two snippets for posterity:

== TO LOG ==

xlog("L_INFO", "contact.uri.host = $sel(@contact.uri.host)\n”);
xlog("L_INFO", "contact.uri.port = $sel(@contact.uri.port)\n”);


== TO COMPARE ==

#!define PORT_SERVICE_A 5062

if ( @contact.uri.port == PORT_SERVICE_A ) {
 xlog(“L_INFO", “Service A: sent $rm\n");
}



Regards,
-Michael




On Nov 12, 2019, at 14:50, Sergiu Pojoga <pojogas at gmail.com<mailto:pojogas at gmail.com>> wrote:

Hi Michael,

@contact.uri.hostport might be what you are looking for.

For more:
http://www.kamailio.org/wiki/cookbooks/devel/selects

Cheers.
--Sergiu

On Tue, Nov 12, 2019 at 8:32 AM Michael Iedema <michael at kapsulate.com<mailto:michael at kapsulate.com>> wrote:
Hello everyone,

I have a potentially silly beginners question: how can I parse the contact port field and act on it in my routing logic?


I know that the $ct variable contains the entire contact header and I can print it in an xlog() call. However, I’d like to do something like the following in my routing logic:


. . . SIP CONTENT

Contact: <sip:someaccount at 192.168.86.104:5062>;expires=1800


. . . CONFIG LOGIC

#!define PORT_SERVICE1 5061
#!define PORT_SERVICE2 5062

route {
   if ( src_port == PORT_SERVICE1 ) {
       xlog(“L_INFO”, “Received $rm from SERVICE1\n”);
   } else if ( src_port == PORT_SERVICE2 ) {
       xlog(“L_INFO”, “Received $rm from SERVICE2\n”);
   }
}


I realize that src_port is not the correct value to compare against. I want to compare against the originating contact’s port value.

How can I extract the port field from $ct?


Many thanks in advance and apologies for the beginners question. I’ve googled for what I think I’m trying to do without any real results on functions or tokenizers, etc. I’m using Kamailio 5.3.0.

Regards,
-Michael


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