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migration:kamailio-3.0-config [2009/05/14 14:27]
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migration:kamailio-3.0-config [2009/11/27 16:27] (current)
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 ====== Kamailio 3.0 Config ====== ====== Kamailio 3.0 Config ======
  
-This page provides guidelines to get the default config file of Kamailio 1.5.x working with SIP Router core. 
  
-Functionalities: +Updated tutorial using the **kamailio_3.0** branch is available at:
-  SIP routing +
-  User location +
-  Authentication +
-  Accounting +
-  * NAT traversal +
-  * Presence server+
  
-[b]IMPORTANT: check the tips page: http://sip-router.org/wiki/migration/kamailio-tips[/b]+http://www.kamailio.org/dokuwiki/doku.php/install:kamailio-3.0.x-from-git
  
-===== 1. Install from GIT ===== 
- 
-<hi #6495ed>It is highly recommended that you have Kamailio 1.5.x installed already so you can use the additional tools coming with that version and not yet included in SIP Router. See here [[http://www.kamailio.org/dokuwiki/doku.php/install:kamailio-1.5.x-from-svn|a step by step guide to install Kamailio 1.5.x from SVN]]</hi> 
- 
-The steps here are given for Unbuntu/Debian based distributions and should be easy to adapt to other Linux distros. 
- 
-==== 1.1. Prerequisites ==== 
- 
-To be able to follow the guidelines from this document you need **root** access. 
- 
-The following packages are required before proceeding to the next steps. 
- 
-  * __git__ client: apt-get install git-core - it is recommended to have the latest version, which might not be part of the distribution yet, but you can get it from: http://git-scm.com/ 
- 
-  * __gcc__ compiler: apt-get install gcc 
- 
-  * __flex__ - apt-get install flex 
- 
-  * __bison__ - apt-get install bison 
- 
-  * __libmysqlclient15-dev__ - apt-get install libmysqlclient15-dev 
- 
-  * __make__ - apt-get install make 
- 
-==== 1.2. Getting sources from GIT ==== 
- 
- 
-First of all, you have to create a directory on the file system where the sources will be stored.  
- 
-<code> 
-  mkdir -p /usr/local/src/sr 
-   
-  cd /usr/local/src/sr 
-</code> 
- 
-Download the sources from GIT using the following command. 
- 
-<code> 
-git clone --depth 1 git://git.sip-router.org/sip-router 
-</code> 
- 
- 
-==== 1.3.Tuning Makefiles ==== 
- 
-Next step is to edit Makefile files to include the MySQL module. 
-<code> 
-  cd sip-router 
-   
-  vim Makefile 
-</code> 
- 
-Remove **db_mysql** from **exclude_modules** variable. 
- 
-Note: if you need PCRE-dependent modules (e.g., lcr, dialplan, regexp), instal the PCRE devel library and uncomment 
- 
- 
-==== 1.4. Compile SIP Router ==== 
- 
-Once the mysql module was removed from excluded modules list, you can compile: 
- 
-<code> 
-  make all 
-</code> 
- 
- 
-==== 1.5. Install SIP Router ==== 
- 
-When the compilation is ready, install with the following command: 
- 
-  make install 
- 
-==== 1.6. What and where was installed ==== 
- 
-The binaries and executable scripts were installed in: 
- 
-<code> 
-  /usr/local/sbin 
-</code> 
- 
-These are: 
- 
-  * __ser__ - SIP Router binary 
- 
- 
-To be able to use the binaries from command line, make sure that '/usr/local/sbin' is set in PATH environment variable. You can check that with 'echo $PATH'. If not and you are using 'bash', open '/root/.bash_profile' and at the end add: 
- 
-  PATH=$PATH:/usr/local/sbin 
-  export PATH 
- 
-SIP Router modules are installed in: 
- 
-  /usr/local/lib/ser/modules/ 
- 
-The documentation and readme files are installed in: 
- 
-  /usr/local/share/doc/ser/ 
- 
-The man pages are installed in: 
- 
-  /usr/local/share/man/man5/ 
-  /usr/local/share/man/man8/ 
- 
-The configuration file was installed in: 
- 
-  /usr/local/etc/ser/ser.cfg 
- 
-However, this configuration file is not the one used by Kamailio (OpenSER) 1.5.x. Section 2 includes it. 
- 
- 
-===== 2. Kamailio Config File ===== 
- 
-  * this is the configuration file from Kamailio (OpenSER) 1.5.x adapted for the development version based on SIP-Router.org project 
-  * it has turned on most of the features that are by default commented (authentication, accounting, nat traversal, presence) 
-  * copy it and paste into **/usr/local/etc/ser/kamailio.org** 
- 
-**Remarks**: 
-  * it runs in debug mode, level 5 
-  * only udp, tcp is disabled 
-  * one child 
- 
-<code> 
-# 
-# $Id: kamailio.cfg 5679 2009-03-10 09:22:27Z ibc_sf $ 
-# 
-# Kamailio (OpenSER) SIP Server - basic configuration script 
-#     - web: http://www.kamailio.org 
-#     - svn: http://openser.svn.sourceforge.net/viewvc/openser/ 
-# 
-# Direct your questions about this file to: <users@lists.kamailio.org> 
-# 
-# Refer to the Core CookBook at http://www.kamailio.org/dokuwiki/doku.php 
-# for an explanation of possible statements, functions and parameters. 
-# 
-# There are comments showing how to enable different features in th econfig 
-# file. Such commented code starts with #X# where X is a letter to identify 
-# a feature. Delete entire #X# if you want to enable that feature. Next are 
-# sed commands that help you enable such features. 
-# 
-# *** To enable mysql execute: 
-#     sed -i 's///g' kamailio.cfg 
-# 
-# *** To enable authentication execute: 
-#     - enable mysql 
-#     sed -i 's///g' kamailio.cfg 
-#     - add users using 'kamctl' 
-# 
-# *** To enable persistent user location execute: 
-#     - enable mysql 
-#     sed -i 's///g' kamailio.cfg 
-# 
-# *** To enable presence server execute: 
-#     - enable mysql 
-#     sed -i 's///g' kamailio.cfg 
-# 
-# *** To enable nat traversal execute: 
-#     sed -i 's///g' kamailio.cfg 
-#     - install RTPProxy: http://www.rtpproxy.org 
-#     - start RTPProxy: 
-#        rtpproxy -l _your_public_ip_ -s udp:localhost:7722 
-# 
-# *** To enhance accounting execute: 
-#     - enable mysql 
-#     sed -i 's///g' kamailio.cfg 
-#     - add following columns to database 
-# ALTER TABLE acc ADD COLUMN src_user VARCHAR(64) NOT NULL DEFAULT ''; 
-# ALTER TABLE acc ADD COLUMN src_domain VARCHAR(128) NOT NULL DEFAULT ''; 
-# ALTER TABLE acc ADD COLUMN dst_ouser VARCHAR(64) NOT NULL DEFAULT ''; 
-# ALTER TABLE acc ADD COLUMN dst_user VARCHAR(64) NOT NULL DEFAULT ''; 
-# ALTER TABLE acc ADD COLUMN dst_domain VARCHAR(128) NOT NULL DEFAULT ''; 
-# ALTER TABLE missed_calls ADD COLUMN src_user VARCHAR(64) NOT NULL DEFAULT ''; 
-# ALTER TABLE missed_calls ADD COLUMN src_domain VARCHAR(128) NOT NULL DEFAULT ''; 
-# ALTER TABLE missed_calls ADD COLUMN dst_ouser VARCHAR(64) NOT NULL DEFAULT ''; 
-# ALTER TABLE missed_call ADD COLUMN dst_user VARCHAR(64) NOT NULL DEFAULT ''; 
-# ALTER TABLE missed_calls ADD COLUMN dst_domain VARCHAR(128) NOT NULL DEFAULT ''; 
-# 
- 
- 
-####### Global Parameters ######### 
- 
-debug=4 
-memdbg=5 
-memlog=5 
-log_stderror=yes 
-log_facility=LOG_LOCAL0 
- 
-fork=yes 
-children=1 
- 
-/* uncomment the following lines to enable debugging */ 
-#debug=6 
-#fork=no 
-#log_stderror=yes 
- 
-/* uncomment the next line to disable TCP (default on) */ 
-disable_tcp=yes 
- 
-/* uncomment the next line to enable the auto temporary blacklisting of  
-   not available destinations (default disabled) */ 
-#disable_dns_blacklist=no 
- 
-/* uncomment the next line to enable IPv6 lookup after IPv4 dns  
-   lookup failures (default disabled) */ 
-#dns_try_ipv6=yes 
- 
-/* uncomment the next line to disable the auto discovery of local aliases 
-   based on revers DNS on IPs (default on) */ 
-auto_aliases=no 
- 
-/* uncomment the following lines to enable TLS support  (default off) */ 
-#disable_tls = no 
-#listen = tls:your_IP:5061 
-#tls_verify_server = 1 
-#tls_verify_client = 1 
-#tls_require_client_certificate = 0 
-#tls_method = TLSv1 
-#tls_certificate = "/usr/local/etc/kamailio/tls/user/user-cert.pem" 
-#tls_private_key = "/usr/local/etc/kamailio/tls/user/user-privkey.pem" 
-#tls_ca_list     = "/usr/local/etc/kamailio/tls/user/user-calist.pem" 
- 
- 
-listen=udp:192.168.1.23:5060 
- 
-/* uncomment and configure the following line if you want Kamailio to  
-   bind on a specific interface/port/proto (default bind on all available) */ 
-#listen=udp:192.168.1.2:5060 
- 
- 
-####### Modules Section ######## 
- 
-#set module path 
-loadpath "./" 
- 
-/* uncomment next line for MySQL DB support */ 
-loadmodule "modules/db_mysql/db_mysql.so" 
-loadmodule "modules_k/mi_fifo/mi_fifo.so" 
-loadmodule "modules_k/mi_datagram/mi_datagram.so" 
-loadmodule "modules_k/kex/kex.so" 
-loadmodule "modules_k/sl/sl.so" 
-loadmodule "modules/tm/tm.so" 
-loadmodule "modules_k/tmx/tmx.so" 
-loadmodule "modules_k/rr/rr.so" 
-loadmodule "modules_k/pv/pv.so" 
-loadmodule "modules_k/maxfwd/maxfwd.so" 
-loadmodule "modules_k/usrloc/usrloc.so" 
-loadmodule "modules_k/registrar/registrar.so" 
-loadmodule "modules_k/textops/textops.so" 
-loadmodule "modules_k/uri_db/uri_db.so" 
-loadmodule "modules_k/siputils/siputils.so" 
-loadmodule "modules_k/xlog/xlog.so" 
-loadmodule "modules_k/acc/acc.so" 
-/* uncomment next lines for MySQL based authentication support  
-   NOTE: a DB (like db_mysql) module must be also loaded */ 
-loadmodule "modules_k/auth/auth.so" 
-loadmodule "modules_k/auth_db/auth_db.so" 
-/* uncomment next line for aliases support 
-   NOTE: a DB (like db_mysql) module must be also loaded */ 
-#loadmodule "modules_k/alias_db/alias_db.so" 
-/* uncomment next line for multi-domain support 
-   NOTE: a DB (like db_mysql) module must be also loaded 
-   NOTE: be sure and enable multi-domain support in all used modules 
-         (see "multi-module params" section ) */ 
-#loadmodule "modules_k/domain/domain.so" 
-/* uncomment the next two lines for presence server support 
-   NOTE: a DB (like db_mysql) module must be also loaded */ 
-loadmodule "modules_k/presence/presence.so" 
-loadmodule "modules_k/presence_xml/presence_xml.so" 
- 
-loadmodule "modules_k/nathelper/nathelper.so" 
- 
-# ----------------- setting module-specific parameters --------------- 
- 
- 
-# ----- mi_fifo params ----- 
-modparam("mi_fifo", "fifo_name", "/tmp/kamailio_fifo") 
- 
- 
-# ----- mi_datagram params ----- 
-modparam("mi_datagram", "socket_name", "udp:127.0.0.1:7744") 
- 
- 
-# ----- rr params ----- 
-# add value to ;lr param to cope with most of the UAs 
-modparam("rr", "enable_full_lr", 1) 
-# do not append from tag to the RR (no need for this script) 
-modparam("rr", "append_fromtag", 0) 
- 
- 
-# ----- rr params ----- 
-modparam("registrar", "method_filtering", 1) 
-/* uncomment the next line to disable parallel forking via location */ 
-# modparam("registrar", "append_branches", 0) 
-/* uncomment the next line not to allow more than 10 contacts per AOR */ 
-#modparam("registrar", "max_contacts", 10) 
- 
- 
-# ----- uri_db params ----- 
-/* by default we disable the DB support in the module as we do not need it 
-   in this configuration */ 
-modparam("uri_db", "use_uri_table", 0) 
-modparam("uri_db", "db_url", "") 
- 
- 
-# ----- acc params ----- 
-/* what sepcial events should be accounted ? */ 
-modparam("acc", "early_media", 1) 
-modparam("acc", "report_ack", 1) 
-modparam("acc", "report_cancels", 1) 
-/* by default ww do not adjust the direct of the sequential requests. 
-   if you enable this parameter, be sure the enable "append_fromtag" 
-   in "rr" module */ 
-modparam("acc", "detect_direction", 0) 
-/* account triggers (flags) */ 
-modparam("acc", "failed_transaction_flag", 3) 
-modparam("acc", "log_flag", 1) 
-modparam("acc", "log_missed_flag", 2) 
-modparam("acc", "log_extra",  
- "src_user=$fU;src_domain=$fd;dst_ouser=$tU;dst_user=$rU;dst_domain=$rd") 
-/* uncomment the following lines to enable DB accounting also */ 
-modparam("acc", "db_flag", 1) 
-modparam("acc", "db_missed_flag", 2) 
-modparam("acc", "db_url", 
- "mysql://openser:openserrw@localhost/openser") 
-modparam("acc", "db_extra", 
- "src_user=$fU;src_domain=$fd;dst_ouser=$tU;dst_user=$rU;dst_domain=$rd") 
- 
- 
-# ----- usrloc params ----- 
-/* uncomment the following lines if you want to enable DB persistency 
-   for location entries */ 
-modparam("usrloc", "db_mode",   2) 
-modparam("usrloc", "db_url", 
- "mysql://openser:openserrw@localhost/openser") 
- 
-# ----- auth_db params ----- 
-/* uncomment the following lines if you want to enable the DB based 
-   authentication */ 
-modparam("auth_db", "calculate_ha1", yes) 
-modparam("auth_db", "password_column", "password") 
-modparam("auth_db", "db_url", 
- "mysql://openser:openserrw@localhost/openser") 
-modparam("auth_db", "load_credentials", "") 
- 
- 
-# ----- alias_db params ----- 
-/* uncomment the following lines if you want to enable the DB based 
-   aliases */ 
-#modparam("alias_db", "db_url", 
-# "mysql://openser:openserrw@localhost/openser") 
- 
- 
-# ----- domain params ----- 
-/* uncomment the following lines to enable multi-domain detection 
-   support */ 
-#modparam("domain", "db_url", 
-# "mysql://openser:openserrw@localhost/openser") 
-#modparam("domain", "db_mode", 1)   # Use caching 
- 
- 
-# ----- multi-module params ----- 
-/* uncomment the following line if you want to enable multi-domain support 
-   in the modules (dafault off) */ 
-#modparam("alias_db|auth_db|usrloc|uri_db", "use_domain", 1) 
- 
- 
-# ----- presence params ----- 
-/* uncomment the following lines if you want to enable presence */ 
-modparam("presence|presence_xml", "db_url", 
- "mysql://openser:openserrw@localhost/openser") 
-modparam("presence_xml", "force_active", 1) 
-modparam("presence", "server_address", "sip:192.168.1.23:5060") 
-modparam("presence_xml", "disable_bla", 1) 
- 
-# -- nathelper 
-modparam("nathelper", "rtpproxy_sock", "udp:127.0.0.1:7722") 
-modparam("nathelper", "natping_interval", 30) 
-modparam("nathelper", "ping_nated_only", 1) 
-modparam("nathelper", "sipping_bflag", 7) 
-modparam("nathelper", "sipping_from", "sip:pinger@kamailio.org") 
-modparam("registrar|nathelper", "received_avp", "$avp(i:80)") 
-modparam("usrloc", "nat_bflag", 6) 
- 
-#extra testing 
-modparam("pv", "avp_aliases", "test=i:11;st=s:asd") 
- 
-####### Routing Logic ######## 
- 
- 
-# main request routing logic 
- 
-route{ 
- 
- if (!mf_process_maxfwd_header("10")) { 
- sl_send_reply("483","Too Many Hops"); 
- exit; 
- } 
- 
- $avp(test) = 1; 
- 
- # NAT detection 
- route(4); 
- 
- if (has_totag()) { 
- # sequential request withing a dialog should 
- # take the path determined by record-routing 
- if (loose_route()) { 
- if (is_method("BYE")) { 
- setflag(1); # do accounting ... 
- setflag(3); # ... even if the transaction fails 
- } 
- route(1); 
- } else { 
- if (is_method("SUBSCRIBE") && uri == myself) { 
- # in-dialog subscribe requests 
- route(2); 
- exit; 
- } 
- if ( is_method("ACK") ) { 
- if ( t_check_trans() ) { 
- # non loose-route, but stateful ACK; must be an ACK after a 487 or e.g. 404 from upstream server 
- t_relay(); 
- exit; 
- } else { 
- # ACK without matching transaction ... ignore and discard.\n"); 
- exit; 
- } 
- } 
- sl_send_reply("404","Not here"); 
- } 
- exit; 
- } 
- 
- #initial requests 
- 
- # CANCEL processing 
- if (is_method("CANCEL")) 
- { 
- if (t_check_trans()) 
- t_relay(); 
- exit; 
- } 
- 
- t_check_trans(); 
- 
- # authentication 
- route(3); 
- 
- # record routing for dialog forming requests (in case they are routed) 
- if (is_method("INVITE|SUBSCRIBE")) 
- record_route(); 
- 
- # account only INVITEs 
- if (is_method("INVITE")) { 
- setflag(1); # do accounting 
- } 
- if (!uri==myself) 
- /* replace with following line if multi-domain support is used */ 
- ##if (!is_uri_host_local()) 
- { 
- append_hf("P-hint: outbound\r\n");  
- # if you have some interdomain connections via TLS 
- ##if($rd=="tls_domain1.net") { 
- ## t_relay("tls:domain1.net"); 
- ## exit; 
- ##} else if($rd=="tls_domain2.net") { 
- ## t_relay("tls:domain2.net"); 
- ## exit; 
- ##} 
- route(1); 
- } 
- 
- # requests for my domain 
- 
- if( is_method("PUBLISH|SUBSCRIBE")) { 
- route(2); 
- } 
- 
- if (is_method("REGISTER")) 
- { 
- if (!save("location")) 
- sl_reply_error(); 
- 
- exit; 
- } 
- 
- if ($rU=="") { 
- # request with no Username in RURI 
- sl_send_reply("484","Address Incomplete"); 
- exit; 
- } 
- 
- # apply DB based aliases (uncomment to enable) 
- ##alias_db_lookup("dbaliases"); 
- 
- if (!lookup("location")) { 
- switch ($rc) { 
- case -1: 
- case -3: 
- t_newtran(); 
- t_reply("404", "Not Found"); 
- exit; 
- case -2: 
- sl_send_reply("405", "Method Not Allowed"); 
- exit; 
- } 
- } 
- 
- # when routing via usrloc, log the missed calls also 
- setflag(2); 
- 
- route(1); 
-} 
- 
- 
-route[1] { 
- if (check_route_param("nat=yes")) { 
- setbflag("6"); 
- } 
- if (isflagset(5) || isbflagset("6")) { 
- route(5); 
- } 
- 
- /* example how to enable some additional event routes */ 
- if (is_method("INVITE")) { 
- #t_on_branch("1"); 
- t_on_reply("1"); 
- t_on_failure("1"); 
- } 
- 
- if (!t_relay()) { 
- sl_reply_error(); 
- } 
- exit; 
-} 
- 
- 
-# Presence route 
-/* uncomment the whole following route for enabling presence server */ 
-route[2] 
-{ 
- if (!t_newtran()) 
- { 
- sl_reply_error(); 
- exit; 
- }; 
- 
- if(is_method("PUBLISH")) 
- { 
- handle_publish(); 
- t_release(); 
- } 
- else 
- if( is_method("SUBSCRIBE")) 
- { 
- handle_subscribe(); 
- t_release(); 
- } 
- exit; 
-  
- # if presence enabled, this part will not be executed 
- if (is_method("PUBLISH") || $rU!="") 
- { 
- sl_send_reply("404", "Not here"); 
- exit; 
- } 
- return; 
-} 
- 
-# Authentication route 
-/* uncomment the whole following route for enabling authentication */ 
-route[3] { 
- if (is_method("REGISTER")) 
- { 
- # authenticate the REGISTER requests (uncomment to enable auth) 
- if (! (www_authorize("", "subscriber"))) 
- { 
- www_challenge("", "0"); 
- exit; 
- } 
- 
- if ($au!=$tU)  
- { 
- sl_send_reply("403","Forbidden auth ID"); 
- exit; 
- } 
- } else { 
- # authenticate if from local subscriber (uncomment to enable auth) 
- if (from_uri==myself) 
- { 
- if (!proxy_authorize("", "subscriber")) { 
- proxy_challenge("", "0"); 
- exit; 
- } 
- if (is_method("PUBLISH")) 
- { 
- if ($au!=$tU) { 
- sl_send_reply("403","Forbidden auth ID"); 
- exit; 
- } 
- } else { 
- if ($au!=$fU) { 
- sl_send_reply("403","Forbidden auth ID"); 
- exit; 
- } 
- } 
- 
- consume_credentials(); 
- # caller authenticated 
- } 
- } 
- return; 
-} 
- 
-# Caller NAT detection route 
-/* uncomment the whole following route for enabling Caller NAT Detection */ 
-route[4]{ 
- force_rport(); 
- if (nat_uac_test("19")) { 
- if (method=="REGISTER") { 
- fix_nated_register(); 
- } else { 
- fix_nated_contact(); 
- } 
- setflag(5); 
- } 
- return; 
-} 
- 
-# RTPProxy control 
-/* uncomment the whole following route for enabling RTPProxy Control */ 
-route[5] { 
- if (is_method("BYE")) { 
- unforce_rtp_proxy(); 
- } else if (is_method("INVITE")){ 
- force_rtp_proxy(); 
- } 
- if (!has_totag()) add_rr_param(";nat=yes"); 
- return; 
-} 
- 
-branch_route[1] { 
- xdbg("new branch at $ru\n"); 
-} 
- 
- 
-onreply_route[1] { 
- xdbg("incoming reply\n"); 
- 
- if ((isflagset(5) || isbflagset("6")) && status=~"(183)|(2[0-9][0-9])") { 
- force_rtp_proxy(); 
- } 
- if (isbflagset("6")) { 
- fix_nated_contact(); 
- } 
-} 
- 
- 
-failure_route[1] { 
- if (is_method("INVITE") 
- && (isbflagset("6") || isflagset(5))) { 
- unforce_rtp_proxy(); 
- } 
- 
- if (t_is_canceled()) { 
- exit; 
- } 
- 
- # uncomment the following lines if you want to block client  
- # redirect based on 3xx replies. 
- ##if (t_check_status("3[0-9][0-9]")) { 
- ## t_reply("404","Not found"); 
- ## exit; 
- ##} 
- 
- # uncomment the following lines if you want to redirect the failed  
- # calls to a different new destination 
- ##if (t_check_status("486|408")) { 
- ## sethostport("192.168.2.100:5060"); 
- ## append_branch(); 
- ## # do not set the missed call flag again 
- ## t_relay(); 
- ##} 
-} 
- 
-</code> 
- 
-===== 3. Run it ===== 
- 
-You must have the database used by Kamailio (OpenSER) 1.5.x created. The name of the database is **openser**. If you installed Kamailio (OpenSER) 1.5.x from SVN using the Dokuwiki guidelines (http://www.kamailio.org/dokuwiki/doku.php/install:kamailio-1.5.x-from-svn), then you should do: 
- 
-<code> 
-/usr/local/sbin/kamdbctl create 
-</code> 
- 
-Start SIP Router with the config above: 
- 
-<code> 
-/usr/local/sbin/ser -f /usr/local/etc/ser/kamailio.cfg 
-</code> 
- 
-===== 4. Remarks ===== 
- 
-<hi #98fb98>Please contribute here with remarks and comments.</hi> 
- 
-  * load kex module for Kamailio core specific extensions 
-  * load tmx module for Kamailio TM specific extensions 
-  * avp_aliases is now a parameter of pv module 
- 
-===== 5. FAQ ===== 
- 
-  * **Q**: Why binary is named ser? 
-    * **A**: It is the default name for SIP Router binary. In the future, the packaged version will differ from what is now. However, right now, it is the short of: "**SIP E Router**" where **E** comes from any of: 
-      * Exceptional 
-      * Excellent 
-      * Exotic (as Kamailio name origins) 
-      * Express (the initial project name) 
-      * Extraordinary 
-      * ... 
  

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