diff --git a/manifests/config.pp b/manifests/config.pp
index 5af5f81..759b2d2 100644
--- a/manifests/config.pp
+++ b/manifests/config.pp
@@ -56,6 +56,9 @@
   $ext_userscontext,
   $ext_includes,
   $ext_execs,
+  $localnet_sip,
+  $externip_sip,
+  $domain_sip,
 ) inherits asterisk {
   File {
     owner => 'root',
diff --git a/manifests/init.pp b/manifests/init.pp
index 980a8e0..e6b7e96 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -151,6 +151,19 @@
 #     asterisk, this is the registration string.
 #   Default: ''
 #
+# [*localnet_sip*]
+#   Array of Strings. Specify networks inside the NAT
+#   Default: []
+#
+# [*externip_sip*]
+#   String. When acting behind a NAT, use this parameter to specify the public
+#     address
+#   Default: ''
+#
+# [*domain_sip*]
+#   String. list of allowed domains
+#   Default: ''
+#
 # [*rtpstart*]
 #   String. Lower limit for RTP port range
 #   Default: 10000
@@ -273,6 +286,9 @@
   $manager_port             = $asterisk::params::manager_port,
   $manager_webenabled       = $asterisk::params::manager_webenabled,
   $register_sip             = $asterisk::params::register_sip,
+  $localnet_sip             = $asterisk::params::localnet_sip,
+  $externip_sip             = $asterisk::params::externip_sip,
+  $domain_sip               = $asterisk::params::domain_sip,
   $rtpstart                 = $asterisk::params::rtpstart,
   $rtpend                   = $asterisk::params::rtpend,
   $udpbindaddr              = $asterisk::params::udpbindaddr,
@@ -306,6 +322,7 @@
   validate_string($ext_writeprotect, $ext_autofallthrough, $ext_patternmatchnew)
   validate_string($ext_static, $ext_clearglobalvars, $ext_userscontext)
   validate_array($ext_includes, $ext_execs)
+  validate_array($localnet_sip)
 
   class { '::asterisk::install':
     package_ensure => $package_ensure,
@@ -356,6 +373,9 @@
     ext_userscontext    => $ext_userscontext,
     ext_includes        => $ext_includes,
     ext_execs           => $ext_execs,
+    localnet_sip        => $localnet_sip,
+    externip_sip        => $externip_sip,
+    domain_sip          => $domain_sip,
   }  ->
   class { '::asterisk::service':
     service_ensure => $service_ensure,
diff --git a/manifests/params.pp b/manifests/params.pp
index fb86f74..bf78f32 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -104,4 +104,9 @@
   $ext_userscontext = 'default'
   $ext_includes = []
   $ext_execs = []
+
+  # SIP networking configuration
+  $localnet_sip = []
+  $externip_sip = ''
+  $domain_sip = ''
 }
diff --git a/templates/sip.conf.erb b/templates/sip.conf.erb
index 7a1a03f..ffca59f 100644
--- a/templates/sip.conf.erb
+++ b/templates/sip.conf.erb
@@ -850,6 +850,13 @@ register => <%= @register_sip %>
 ;
 ; subscribe_network_change_event = yes ; on by default
 
+<%- @localnet_sip.each do |net| -%>
+localnet = <%= net %>
+<%- end -%>
+<%- if @externip_sip!='' -%>
+externip = <%= @externip_sip %>
+<%- end -%>
+
 ;----------------------------------- MEDIA HANDLING --------------------------------
 ; By default, Asterisk tries to re-invite media streams to an optimal path. If there's
 ; no reason for Asterisk to stay in the media path, the media will be redirected.
@@ -977,6 +984,9 @@ register => <%= @register_sip %>
 ; To disallow requests for domains not serviced by this server:
 ; allowexternaldomains=no
 
+<%- if @domain_sip!='' -%>
+domain = <%= @domain_sip %>
+<%- end -%>
 ;domain=mydomain.tld,mydomain-incoming
                                 ; Add domain and configure incoming context
                                 ; for external calls to this domain