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Table of Contents

SIP Router: Core Cookbook

This tutorial collects the functions and parameters exported by SIP Router core to configuration file.

Core Keywords

Keywords specific to SIP messages which can be used mainly in 'if' expressions.

af

The address family of the received SIP message. It is INET if the message was received over IPv4 or INET6 if the message was received over IPv6.

Exampe of usage:

    if (af==INET6) {
        log("Message received over IPv6 link\n");
    }

dst_ip

The IP of the local interface where the SIP message was received. When the proxy listens on many network interfaces, makes possible to detect which was the one that received the packet.

Example of usage:

   if(dst_ip==127.0.0.1) {
      log("message received on loopback interface\n");
   };

dst_port

The local port where the SIP packet was received. When SIP-Router is listening on many ports, it is useful to learn which was the one that received the SIP packet.

Example of usage:

   if(dst_port==5061)
   {
       log("message was received on port 5061\n");
   };

from_uri

This script variable is a reference to the URI of 'From' header. It can be used to test 'From'- header URI value.

Example of usage:

    if(is_method("INVITE") && from_uri=~".*@sip-router.org")
    {
        log("the caller is from sip-router.org\n");
    };

method

The variable is a reference to the SIP method of the message.

Example of usage:

    if(method=="REGISTER")
    {
       log("this SIP request is a REGISTER message\n");
    };

msg:len

The variable is a reference to the size of the message. It can be used in 'if' constructs to test message's size.

Example of usage:

    if(msg:len>2048)
    {
        sl_send_reply("413", "message too large");
        exit;
    };

.

proto

This variable can be used to test the transport protocol of the SIP message.

Example of usage:

    if(proto==UDP)
    {
        log("SIP message received over UDP\n");
    };

status

If used in onreply_route, this variable is a referece to the status code of the reply. If it used in a standard route block, the variable is a reference to the status of the last reply sent out for the current request.

Example of usage:

    if(status=="200")
    {
        log("this is a 200 OK reply\n");
    };

src_ip

Reference to source IP address of the SIP message.

Example of usage:

    if(src_ip==127.0.0.1)
    {
        log("the message was sent from localhost!\n");
    };

src_port

Reference to source port of the SIP message (from which port the message was sent by previous hop).

Example of usage:

    if(src_port==5061)
    {
        log("message sent from port 5061\n");
    }

to_uri

This variable can be used to test the value of URI from To header.

Example of usage:

  if(to_uri=~"sip:.+@sip-router.org")
  {
      log("this is a request for sip-router.org users\n");
  };

uri

This variable can be used to test the value of the request URI.

Example of usage:

    if(uri=~"sip:.+@sip-router.org")
    {
        log("this is a request for sip-router.org users\n");
    };

Core Values

Values that can be used in 'if' expressions to check against Core Keywords

INET

This keyword can be used to test whether the SIP packet was received over an IPv4 connection.

Example of usage:

    if (af==INET) {
        log("the SIP message was received over IPv4\n");
    }

INET6

This keyword can be used to test whether the SIP packet was received over an IPv6 connection.

Example of usage:

  if(af==INET6)
  {
      log("the SIP message was received over IPv6\n");
  };

TCP

This keyword can be used to test the value of 'proto' and check whether the SIP packet was received over TCP or not.

Example of usage:

  if(proto==TCP)
  {
      log("the SIP message was received over TCP\n");
  };

UDP

This keyword can be used to test the value of 'proto' and check whether the SIP packet was received over UDP or not.

Example of usage:

  if(proto==UDP)
  {
      log("the SIP message was received over UDP\n");
  };

max_len

This keyword is set to the maximum size of an UDP packet. It can be used to test message's size.

Example of usage:

    if(msg:len>max_len)
    {
        sl_send_reply("413", "message too large to be forwarded over UDP without fragmentation");
        exit;
    }

myself

It is a reference to the list of local IP addresses, hostnames and aliases that has been set in SIP-Router configuration file. This lists contain the domains served by SIP-Router.

The variable can be used to test if the host part of an URI is in the list. The usefulness of this test is to select the messages that has to be processed locally or has to be forwarded to another server.

See "alias" to add hostnames,IP addresses and aliases to the list.

Example of usage:

    if(uri==myself) {
        log("the request is for local processing\n");
    };

null

Can be used in assignment to reset the value of a per-script variable or to delete an avp.

Example of usage:

    $avp(i:12) = null;
    $var(x) = null;

Core parameters

advertised_address

advertised_port

alias

check_via

children

chroot

debug

description|descr|desc

disable_core_dump

disable_sctp

disable_tcp

disable_tls|tls_disable

dns

dns_cache_del_nonexp|dns_cache_delete_nonexpired

dns_cache_flags

dns_cache_gc_interval

dns_cache_init

dns_cache_max_ttl

dns_cache_mem

dns_cache_min_ttl

dns_cache_negative_ttl

dns_retr_no

dns_retr_time

dns_sctp_pref|dns_sctp_preference

dns_search_full_match

dns_servers_no

dns_srv_lb|dns_srv_loadbalancing

dns_tcp_pref|dns_tcp_preference

dns_tls_pref|dns_tls_preference

dns_try_ipv6

dns_try_naptr

dns_udp_pref|dns_udp_preference

dns_use_search_list

dst_blacklist_expire|dst_blacklist_ttl

dst_blacklist_gc_interval

dst_blacklist_init

dst_blacklist_mem

enable_sctp

enable_tls|tls_enable

exit_timeout|ser_kill_timeout

fork

group|gid

listen

loadmodule

loadpath

log_facility

log_stderror

maxbuffer

max_while_loops

mcast_loopback

mcast_ttl

memdbg|mem_dbg

memlog|mem_log

mhomed

mlock_pages

modparam

open_files_limit

phone2tel

pmtu_discovery

port

real_time

reply_to_via

rev_dns

rt_policy

rt_prio

rt_timer1_policy|rt_ftimer_policy

rt_timer1_prio|rt_fast_timer_prio|rt_ftimer_prio

rt_timer2_policy|rt_stimer_policy

rt_timer2_prio|rt_stimer_prio

sctp_autoclose

sctp_children

sctp_send_retries

sctp_send_ttl

sctp_socket_rcvbuf|sctp_socket_receive_buffer

sctp_socket_sndbuf|sctp_socket_send_buffer

server_id

server_signature

shm_force_alloc

sip_warning

statistics

stun_allow_fp

stun_allow_stun

stun_refresh_interval

syn_branch

tcp_accept_aliases

tcp_buf_write|tcp_async

tcp_children

tcp_connection_lifetime

tcp_connect_timeout

tcp_conn_wq_max

tcp_crlf_ping

tcp_defer_accept

tcp_delayed_ack

tcp_fd_cache

tcp_keepalive

tcp_keepcnt

tcp_keepidle

tcp_keepintvl

tcp_linger2

tcp_max_connections

tcp_no_connect

tcp_poll_method

tcp_send_timeout

tcp_source_ipv4

tcp_source_ipv6

tcp_syncnt

tcp_wq_max

tls_ca_list

tls_certificate

tls_handshake_timeout

tlslog|tls_log

tls_method

tls_port_no

tls_private_key

tls_require_certificate

tls_send_timeout

tls_verify

tos

use_dns_cache

use_dns_failover

use_dst_blacklist

user|uid

workdir|wdir

Core functions

Routing blocks

Script statements

Script operations


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