Hello, it would not be easy to give some numbers here, because it is a matter of how complex regular expressions you are using. This will impact the CPU when applying the rule. Then, if you have a lot of rules, of course, size of memory matters. I expect that if you stay in range of hundreds, or even low thousands, all should be smooth -- would be good to do some tests, though. What I typically recommend is to group rules per several dialplan ids with lower number of records, instead of using one for everything and having lots of records. You can have a group that is just leading to the other ids to be used via attrs value (or use a prefix matching to select the appropriate dialplan id). Think like using a simpler matching expression that can lead to a specific id, then the rules in the group with this id will do the transformation. Cheers, Daniel On 30.11.18 12:39, Enrico Bandiera wrote: -- Daniel-Constantin Mierla -- www.asipto.com www.twitter.com/miconda -- www.linkedin.com/in/miconda Kamailio World Conference -- www.kamailioworld.com Kamailio Advanced Training, Nov 12-14, 2018, in Berlin -- www.asipto.com