Dynamic LCR engine for FreeSwitch
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README.md

Build Status

About

tough-rate is a Least Cost Routing (LCR) application for FreeSwitch.

It runs under Node.js and uses CouchDB for provisioning.

It is part of the CCNQ SoftSwitch.

Controlling Records

Gateway Attributes

The following parameters are common to all gateways, they might be inserted by carrier records, gateways definitions, rulesets, destination, individual rules, or individual item in a gwlist. They are all optional.

disabled          (default false)
progress_timeout  (default 4)  from invite to progress (180, 183, ...) - maximum post-dial-delay
answer_timeout    (default 90) from progress to answer (200) - maximum ringback time
dialog_timeout    (default 28800) from answer to end - maximum call duration
attrs             (default {})

The following attributes are available as well, but generally not defined at the gateway level:

priority          (default: 0 for the last gateway in a list, 1 for the previous one, etc.)
local_gateway_extra_priority (default 0.5)  added to priority if the gateway is on the same host
weight            (default 1, must be > 0)
gwlist            (default [])

Different attribute values might be present. They are always resolved in the following order: default, carrier, gateway, ruleset, destination, rule, gwlist entry.

The values in attrs are merged, the most specific value is kept. The values for disabled are ORed so that any item disabled in the list will disable.

gateway (individual gateway records)

_id: "gateway:#{sip_domain_name}:#{gwid}"
type: 'gateway'

sip_domain_name
gwid
address           (required) "#{ip}:#{host}", DNS name
carrierid         (optional)

disabled
progress_timeout
answer_timeout
dialog_timeout
attrs

gateway (as part of host)

Gateways are defined inside sip_profiles; the following fields are available inside a given sip_profiles entry:

egress.gwid
egress.carrierid

egress.disabled
egress.progress_timeout
egress.answer_timeout
egress.dialog_timeout
egress.attrs

The following gateway fields do not need to be specified:

  • address is computed based on the profile's data;
  • sip_domain_name is taken from the host.

carrier

A carrier offers one or more gateways.

A carrier is indicated alongside a gateway definition, either inside a gateway record, or in the sip_profiles part of a host definition.

A carrier record might optionally be created to provide carrier-wide default values for the gateways listed under that carrier.

_id: "carrier:{sip_domain_name}:{carrierid}"
type: 'carrier'

sip_domain_name
carrierid
try (default 1, must be > 0)

local_gateway_extra_priority
disabled
progress_timeout
answer_timeout
dialog_timeout
attrs

ruleset

Rulesets records are found in the main provisioning database.

_id: "ruleset:#{sip_domain_name}:#{groupid}"
type: 'ruleset'
sip_domain_name
groupid
title
description
database

disabled
attrs

The title is the name shown in the management tools. The description is a longer description of what this ruleset is about. The database indicates the name of the database used to store the ruleset.

Rules

Rules are defined in a ruleset database. There is one ruleset database per ruleset.

The gwlist is converted into a list of gateways as follows:

  • Each record in the list is assigned an additional priority, starting from 0 for the last item in the list and adding 1 going backwards in the list.
  • Records which have a carrierid and no gwid are replaced with a list of the gateways for that carrierid, up to try entries. The value of try defaults to the number of gateways for that carrier. Gateways are selected using weighted round-robin.
  • Records which have a gwid are gateways. Other records are rejected.
  • Any gateway local to the host receives an additional local_gateway_priority (by default 0.5).
  • In the resulting list, gateways are sorted by descending priority if no weight field is present.

destination

A destination record might be referenced by a prefix in order to provide values for that prefix.

_id: "destination:#{destination}"
type: 'destination'
destination: destination

disabled

gwlist: [
  {gwid, weight, attrs,...}
  {carrierid, weight, try, attrs,...}
]

progress_timeout
answer_timeout
dialog_timeout
attrs

prefix record

Prefixes are first looked-up in prefix records:

_id: "prefix:{prefix}"
type: 'prefix'
prefix: "{prefix}"

disabled

destination: "{destination}"

Sometimes it is more convenient to store data directly inside the prefix:

_id: "prefix:{prefix}"
type: 'prefix'
prefix: "{prefix}"

gwlist: [
  {gwid, weight, attrs,...}
  {carrierid, weight, try, attrs,...}
]

disabled
progress_timeout
answer_timeout
dialog_timeout
attrs