[sr-dev] dns_cache_rec_pref not supported in the config file

Hi, My name is Stefan and I am a new member of the 1&1 VoIP team. I have noticed that parsing support is not implemented for the dns_cache_rec_pref core parameter although this parameter is documented in doc/cfg_list/docbook/cfg_core.xml. Thus, one can not set the parameter's value in kamailio config file. I had noticed the problem due to an an increase in the real_used_size memory when "kamctl stats shmem" was issued, after DNS SRV queries were made (when SRV are not added manually using kamctl). The SRV (0 ttl) and resulting A (3600 ttl) records are added in kamailio's memory even if the same entries already exist; the existing entries are _not_ overwritten even if they are the same and are kept in memory until the ttl expires. This is because dns_cache_rec_pref is 0 by default which means that it won't check for duplicates. This can be also seen using "kamcmd dns.view" and "kamcmd dns.mem_info". In my opinion, this core parameter should be supported. We have a little patch for this. I want to ask you if there is an explicit reason for not being implemented yet? Regards, Stefan