IP Telephony Service (Edge)

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The IP Telephony Service allows calls from an IC-EDGE site to public telephones without need to use additional hardware such as MP-114 gateways. The IC-EDGE System connects to a SIP trunk provider which has access to telephony calls. This article describes how to configure an IP Telephony Service in IC-EDGE System.


IP Telephony Service has the following requirements:

  • The Edge Controller must have software version 5.1.3.x
  • The stations and SIP trunk providers must support at least G711u, G711a or G722.
  • SIP trunk provider must support registration and must support symmetric NAT handling

Basic Settings

The Edge Controller needs to register towards a SIP trunk provider in order to get telephony calls working. Select Edge Controller > System Configuration > IP Telephony Service to access the page for configuring the IP Telephony Service.

The Edge Controller is configured and ready to use

Account Settings:

  • Prefix - The number for dialing out. Default 0. For example 04740002500, then 0 is stripped and 4740002500 is sent to SIP trunk provider.
  • Host - The host providing the SIP resource. It can be a hostname of the SIP provider, or it can also be an IP address. For example
  • Proxy Host - Some SIP providers requires that the SIP messages go through a proxy. The SIP trunk provider should inform if this is needed. For example, the SIP provider Ringcentral requires messages to go through a proxy.
  • Proxy Port - Used together with proxy host. The default proxy port is 5060.
  • Profile - Configure to restrict/allow call destinations and other features. The default profile is "Default".
  • Default External Number - Stations making outgoing calls will by default use this number. An exception is if the station is configured as a direct destination in the "internal number" list.

Account Details:

  • Internal Number - Is used to decide which internal number inside the IC-EDGE System is associated with the external number. If "Two Stage" is chosen, then incoming calls from the trunk provider will be prompted to dial a number inside the call. If a station or group call is chosen, then incoming calls from the trunk provider will be routed to that number immediately. If a station is chosen, the outgoing call from the station will be made from that external number.
  • External Number - The E.164 telephony number received from trunk provider.
  • Account SIP ID - The Edge Controller uses SIP ID to register towards trunk provider. Depending on the provider this may be the same as the external number.
  • Auth User - The Edge Controller uses this Auth User to authenticate the account. Depending on provider this may be the same as account SIP ID.
  • Auth Password - The Edge Controller uses Auth Password to authenticate the account at the SIP provider.
Note icon In order to use the IP Telephony Service and to be able to connect to your SIP provider, your Edge Controller must have Static IP and DNS Servers set up (can be set up in Main Settings)

Static IP and DNS settings must be set up

Interactive Voice Response

By default the edge controller has English wav files for Interactive Voice Response (IVR). It is possible to upload custom voice response. Select Edge Controler > System Configuration > IP Telephony Service to access the page for configuring the Interactive Voice Response.

Interactiove Voice Response Settings

Interactive Voice Response is used in 3 different scenarios:

  • Enter Pin - The user is prompted to enter a pin when calling from trunk provider
  • Enter Local Number - The user is prompted to enter a local number when doing Two Stage dialing
  • Voice Message While Ringing - Played when the call is ringing from SIP trunk provider. Normally the ringing tone from telephony is used, but for calls using Two Stage dialing or pin code this message is played instead.


  • Pin code - Can be used to only allow people with knowledge about pin code to call in. It can be used for both Two Stage and direct calls.
  • Whitelist - Used to only allow certain telephony numbers to call in from trunk provider. Other telephony numbers are rejected. Note that the format should be E.164 without + sign. See below for examples.
Security Settings


IP Telephony Service has the following limitations:

  • A maximum of two active calls over IP Telephony service at the same time
  • A maximum time for ringing is 2 minutes
  • A maximum time when calling in (prompt for pin code + prompt for directory number) is 1 minute
  • A maximum conversation time is 1 hour