Hi..Appologies.. New to this community. Now i understood that that pstn_route applies to a block but not the routing. Thanks for that information.I will have a look on the pdt, mtree/lcr modules.. regards. On Wednesday, 14 October, 2020, 1:46:48 pm GMT+1, Daniel-Constantin Mierla <miconda(a)gmail.com> wrote: Hello, do not send emails to both sr-dev and sr-users mailing lists when you have questions about using Kamailio, sr-dev is only for discussing about code development for project or what is only in development branch (not part of a stable release). I removed sr-dev from recipients. I think you haven't understood what prefix_route module does: it execute route blocks from configuration file, it does not set the destination address based on a prefix. For that look at pdt module for a simple solution. Other modules such as mtree or lcr could be alternatives, but from simplicity point of view, pdt is better fr this case imo. Cheers, Daniel On 14.10.20 14:27, sai Sudheer wrote: Hii, I am trying to use pstn_route module for the first time, and i want to route the invite to specific pstn server based on its prefix. I have loaded the module & setup the DB, and it's giving error saying route name (from DB) is not defined after adding the a prefix into DB table., and there were no errors when DB table is empty. Not sure how to defined it, or i dont know what did i miss. Please help. #### CONFIG ########## loadmodule "prefix_route.so" modparam("prefix_route", "db_url", "mysql://xxxxx:xxxxx@localhost/kamailioDB") modparam("prefix_route", "db_table", "new_prefix_route") #PSTN Routing table contains          if (!prefix_route("+44")) {               xlog("L_INFO", "+44 prefix didnt match with prefix_route DB\n");          } ########## DB#### MariaDB [kamailio]> select * from new_prefix_route; Empty set (0.00 sec) MariaDB [kamailio]> exit; ########## Kamailio looks good untill here, no errors..  # Now i have added a prefix into sql DB INSERT INTO new_prefix_route VALUES ("+44", "10.10.1.1:5060", "route for this prefix"); ########### Error log after adding a prefix into new_prefix_route table & restart of kamailio  0(5802) CRITICAL: prefix_route [prefix_route.c:72]: add_route(): route name '10.10.1.1:5060' is not defined  0(5802) NOTICE: prefix_route [prefix_route.c:170]: pr_db_load(): Total prefix routes loaded: 1  0(5802) ERROR: prefix_route [prefix_route.c:174]: pr_db_load(): error flushing tree  0(5802) CRITICAL: prefix_route [prefix_route.c:212]: mod_init(): db load failed I have tried a "name" instead of IP (though i dont know how to convert that "name" into a IP:Port), But i am still getting same error using "name" instead of IP:port @ route field in DB. Please help. _______________________________________________ Kamailio (SER) - Development Mailing List sr-dev(a)lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-dev -- Daniel-Constantin Mierla -- www.asipto.com www.twitter.com/miconda -- www.linkedin.com/in/miconda Funding: https://www.paypal.me/dcmierla