[sr-dev] [kamailio/kamailio] lost: dynamic HELD url resolving (#2574)

[Wolfgang Kampichler]

NAPTR support is a good idea and basically also applicable to the LoST service (which I have on my ToDo list anyway). I will have a look at it - just one question: 

I assume item (1) below refers to the device IP address (i.e. UE) for reverse DNS (as in https://tools.ietf.org/html/rfc7216#section-4), which may not work in any case. How about expanding the discovery procedure with a NAPTR request sent to the provider's domain (as found in From and/or P-A-I) in case (1) fails?

(1) Kamailio send reverse .in-addr.arpa. or .ip6.arpa. DNS request and caller host DNS name;
(2) Kamailio send LIS:HELD NAPTR request for a resolved caller hostname and LIS server.
(3) Kamailio send HELD request for resolved LIS address.


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