Hi Patrick, I'm running into a similar issue with `topos` I have kamailio setup to use 2 interfaces, one for ingress, and one for egress traffic. In this setup, `topos` routing does not work Were you able to find a solution?  On Fri, Mar 18, 2022 at 4:34 AM Patrick Karton &lt;patrickarton(a)hotmail.com&gt; wrote: Caller <--> (internal_IP) Kamailio (external_IP) <---> Callee I have this set up of kamailio with 2 interfaces. i use topos module for topology hiding and what i want to do is to send  external_IP in Contact Header of request relayed to Callee and internal_IP in Contact Header of response relayed to Caller. i noticed that : when i use topos module with contact_mode to 0 all Record-Route and Caller Via Header are removed and thats great. but i dont find way to put 2 different  ip addresses in Request and Response Contact Header? when i use contact_mode to 2 Record-Route and Caller Via Header are not anymore removed thats bad for topology hiding. And its seems we can not $xavu(_tps_=>contact_host)  parameter of module to put 2 different  ip addresses in Request and Response Contact Header. What i want is : - remove all Record-Route and Caller Via Header for request like when contact_mode to 0 - and put 2 different  ip addresses in Request and Response Contact Header is it possible to achieve it ? Thanks. ------------------------------------------------------------------------ *De :* sr-users &lt;sr-users-bounces(a)lists.kamailio.org&gt; de la part de Patrick Karton &lt;patrickarton(a)hotmail.com&gt; *Envoyé :* jeudi 17 mars 2022 19:39 *À :* Henning Westerholt &lt;hw(a)gilawa.com&gt;om>; Kamailio (SER) - Users Mailing List &lt;sr-users(a)lists.kamailio.org&gt; *Objet :* Re: [SR-Users] enable topology hiding on one side or dynamic ip in topoh module Contact and Via Header   Thanks For the link. but i dont know exactly how to make the topos module work! i have enabled it on my kamailio script but i have some issues. *  in the relayed request, received Via is removed and only kamailio Via is left. thats great for topology hiding. * in the relayed request there is no Contact Header. i assume the module removes the received one  and must insert a new one . loadmodule "db_text.so" loadmodule "topos.so" modparam("db_text", "db_mode", 0) modparam("db_text", "emptystring", 0) modparam("db_text", "file_buffer_size", 8192) modparam("db_text", "max_result_rows", 1000) modparam("topos", "storage", "db") modparam("topos", "db_url", "text:///home/sbc/database") modparam("topos", "mask_callid", 0) modparam("topos", "sanity_checks", 0) modparam("topos", "contact_host", "127.0.0.1") modparam("topos", "contact_mode", 0) ########### topos_t file table id(int,auto) rectime(int,null) x_context(string,null) s_method(string,null) s_cseq(string,null) a_callid(string,null) a_uuid(string,null) b_uuid(string,null) direction(int,null) x_via(string,null) x_vbranch(string,null) x_rr(string,null) y_rr(string,null) s_rr(string,null) x_uri(string,null) a_contact(string,null) b_contact(string,null) as_contact(string,null) bs_contact(string,null) x_tag(string,null) a_tag(string,null) b_tag(string,null) a_srcaddr(string,null) b_srcaddr(string,null) a_socket(string,null) b_socket(string,null) do i need to insert some records in table or the module does it ? ------------------------------------------------------------------------ *De :* Henning Westerholt &lt;hw(a)gilawa.com&gt; *Envoyé :* jeudi 17 mars 2022 17:37 *À :* Kamailio (SER) - Users Mailing List &lt;sr-users(a)lists.kamailio.org&gt; *Cc :* Patrick Karton &lt;patrickarton(a)hotmail.com&gt; *Objet :* RE: enable topology hiding on one side or dynamic ip in topoh module Contact and Via Header   Hello,   have a look at this event route: https://kamailio.org/docs/modules/5.5.x/modules/topos.html#topos.e.msg_outg… <https://kamailio.org/docs/modules/5.5.x/modules/topos.html#topos.e.msg_outgoing>   Cheers,   Henning   -- Henning Westerholt – https://skalatan.de/blog/ <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 *Patrick Karton *Sent:* Wednesday, March 16, 2022 7:28 PM *To:* sr-users(a)lists.kamailio.org *Subject:* [SR-Users] enable topology hiding on one side or dynamic ip in topoh module Contact and Via Header   Hello ,    im using kamailio with two interfaces external and internal.   i need a way either to :    ·         enable topoh hiding only when outgoing interface is external ( mask contact and Via ip only when ougoing interface is external ·         or if it is not possible to enable it only in one direction.i want to know how to configure dynamic(for example in xavp or avp) ip to put in Contact and Via when topoh is enabled. i see that the *'mask_ip'* parameter of topoh module is a string. so we can not set a dynamic value here unfortunately.   Thanks     __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions   * sr-users(a)lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! 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