Hello, I have only relevant experience with the carrierroute module. This module has support for different prefix/suffix per carrier for example. About the different headers, this might be maybe easier to be implemented with the lcr module flags support. Table reload with RPC commands support both modules. About the alarming, you probably need to setup something here on your own. Another idea is to combine one of the module with a database or htable lookup, or even go only with a database query in a custom table, performance wise is the in-memory storage that the mentioned modules provide in many cases not necessary anymore. Cheers, Henning -- Henning Westerholt - https://skalatan.de/blog/ Kamailio services - https://gilawa.com<https://gilawa.com/> From: sr-users &lt;sr-users-bounces(a)lists.kamailio.org&gt; On Behalf Of Edward Romanenco Sent: Sunday, April 19, 2020 2:25 PM To: sr-users(a)lists.sip-router.org Subject: [SR-Users] LCR and fallback Hi! I would like to implement LCR and fallback capabilities for my Kamailio installation. I'm currently using the dispatcher module with a simple configuration file. As I understood, there are multiple modules (carrier route, dynamic routing) that can be used to achieve that, what I'm aiming for is - * Country-based (or prefix-based) routing with up to 4 different carriers (could be expanded in the future, but I won't have more than a dozen), while also maintaining a fallback route if the 1st priority is not available. * Each of my carriers have his own requirements for headers and formatting, for instance, for one of our carriers, having a '+' prefix before dialing to a non-US number is mandatory, while on the others - it is not, or another example - one of my carriers doesn't allow having a P-Asserted-Identity header in my invite, while others do. I would love to have the option to manipulate headers based on the route that I have chosen, both on the default and fallback routes. * It would be nice to receive SMTP or SNMP alerts if a fallback does occur. * Easy management, having the ability to load and reload the routing table on a monthly basis, once the pricing list is changed. What would be your suggestion? Edward