[SR-Users] Why set this flag on registration?

[Isaac]

Right. However, in this case I didn't think the "FLB_IPV6" flag was 
being used by any modules. I did some research and came across this on 
https://www.kamailio.org/dokuwiki/doku.php/utils:flags

"branch flags - (NEW) are saved also in transaction, but per branch; 
also they will be saved in usrloc (per contact). A new set of functions 
were added for manipulating these flags from script. So, there flags 
will be registration persistent and branch persistent."

I don't see anything in the register module that could be used to 
extract flags from usrloc so I simply added this to the dial-plan but it 
didn't return true.

     if(isflagset(FLB_IPV6))
         {
              xlog("L_WARN","FLB_IPV6 WAS SET! \n");

         }


Thanks

On 10/25/2018 8:04 AM, Alex Balashov wrote:
> Hi Isaac,
>
> Not all flags are explicitly used elsewhere in the logic of a config;
> some are used to convey information to modules.
>
> In this case:
>
>     modparam("nathelper", "sipping_bflag", FLB_NATSIPPING)
>
>     https://kamailio.org/docs/modules/5.1.x/modules/nathelper.html#nathelper.p.sipping_bflag
>
> In other words, if this branch flag is set, this Contact will be marked
> by the nathelper module for periodic pinging via OPTIONS or INFO[1]. The
> purpose of this periodic server-side pinging is to keep NAT pinholes
> alive.
>
> -- Alex
>
> [1] https://kamailio.org/docs/modules/5.1.x/modules/nathelper.html#nathelper.p.sipping_method
>
> On Thu, Oct 25, 2018 at 07:35:48AM -0700, Isaac wrote:
>
>> Hello,
>>
>> In the example for a dual-stack IPv6/IPv4 Kamailio setup here: https://kb.asipto.com/kamailio:kamailio-mixed-ipv4-ipv6 the "FLB_IPV6" flag is being sent on IPv6 registrations. Why set this flag on IPv6 registrations? If I understand correctly, registration requests never make it beyond !save("location so it's not like the flag can be used further in the dial-plan.
>>
>> The code in question:
>>
>> route[REGISTRAR] {
>> 	if (is_method("REGISTER"))
>> 	{
>> 		if(isflagset(FLT_NATS))
>> 		{
>> 			setbflag(FLB_NATB);
>> 			# uncomment next line to do SIP NAT pinging
>> 			## setbflag(FLB_NATSIPPING);
>> 		}
>> 		if(af==INET6)
>> 			setbflag(FLB_IPV6);
>> 		if (!save("location"))
>> 			sl_reply_error();
>> 		exit;
>> 	}
>> }
>>
>>
>> Any help is appreciated.
>>
>> Thanks
>>
>>
>> _______________________________________________
>> Kamailio (SER) - Users Mailing List
>> sr-users at lists.kamailio.org
>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users