HFO Telecom NGN (T440/640 SW-version 2.0.0)

Outgoing CallsYes
Incoming CallsYes
CLIP incomingYes
CLIP outgoingYes
Call ForwardingYes
Call TransferYes
Call WaitingYes
Anonymous CallYes
A-number forwardingYes
Faxsee chart below




Gigaset T440/T640 PRO settings.

For entering a new SIP trunk into the PBX, you need some steps:

  1. Adding a new Gateway group
  2. Adding a new SIP gateway
  3. Defining the inbound routes (assignment of number to extension)
  4. Defining the outbound routes

Let's assume our SIP trunk contains the following numbers:


And we choose follwowing internal numberblock:


And we have a '0' as line-prefix.

Gateway Group

In the Gigaset PBX go to "Administration" - "Routes" - "Gateway groups" enter a name for the new group and click on: Create new group

In the Gateway group you have to define the Outbound Caller ID, the Inbound DIDs (how the number is forwarded to the Inbound routes) and the Inbound caller ID (number presentation of external caller). in addition you can permit here inbound calls in general for this gateway group.


Example of HFO SIP trunk gateway group settings.

Outbound caller ID

As just the last digit of the trunk number block is changing, you can select just the last digit (in brackets) and put it into the variable $1. As the provider wants the signalling number in the format (city-code)(number), you have to enter this number into the next line (here: 0891234567$1, where the $1 represents the changing part).

For external calls, we will present e.g. 08912345678 to the provider, and he will take care about the correct representation to the called party.

Asserted Identity

These fields are used specially for external forwardings. Some providers need special settings in order to present the correct number at the receiving party. For HFO Telekom, you can copy the entries from the Outbound caller ID fields. Here: \d\d(\d) and 0891234567$1 (new screenshot will follow).

Inbound DIDs

For incoming calls, you can use the regular expression, generated by the setup assistant. In your case you would have to adjust the city-code and the pilot-number, according to your line-settings.


This expression cuts all possibly available country- and city-codes and the pilot-number from the incoming number and only the extension is remaining (here: 678). This will be forwarded to the Inbound Routes.

Inbound caller ID

For incoming calls, we will add an additional 0 in front of the external number of the caller, in order to use the callback-feature of the phone (e.g. 0089987654321). During the call-setup the additional 0 will be automatically removed.


This field will be empty when you create this Gateway group. It will show later the assigned SIP gateways.



SIP gateway

In the Gigaset PBX go to "Administration" - "Routes" - "SIP gateways" enter a name for the new gateway and click on: Create new gateway

The SIP gateway contains all necessary data for the registration and dial command and how the number is delivered to/from the provider.

Just enter or choose the values according to your contract or NGN data you received from the provider.


Example of HFO SIP gateway settings 1/2.

Example of HFO SIP gateway settings 2/2.


Use here the SIP-Server / Registrar (as mentioned on the paper, received by HFO Telekom).



Enter here the Proxy-Server, followed by ';lr'.



Enter here the Username (Benutzername), followed by '@extrasip.de'. Extrasip.de is a registered address/realm from HFO Telecom. This is needed to properly register the trunk at the provider.

For example


Dial command

The dial command is the command which is used in the asterisk software. The term {number:1}  means, that at the dialled number (e.g. 0089987654321) the first digit is removed. If you don't use a line access code (in most cases '0' is used), you have to remove the ':1' ! ! !


Select here the previously created gateway group.

Update remote party ID (CLIP)

To display the correct extension at external parties, you have to use the P-Asserted-Identity (PAI) setting. If this is not selected, only the head-number (e.g. 0891234567-0) will be presented, no matter which extension is used for dialing.

From Domain

Enter here the Domain/Realm delivered by HFO Telecom


T38 support

In order to have a better fax-support for fax-machines, connected to the FXS ports, please deactivate this option. In case only T38 faxes are used in the communication, you can  activate this option. Activated T38 option may lead to wrong error messages when sending faxes via machines which are connected to the FXS ports.


Underneath the configuration parameter you will see a preview of the complete sip.conf file.


Inbound routes

In the Gigaset PBX go to "Administration" - "Routes" - "Inbound routes" select the correct Gateway group and press Show.

In addition it is advised to activate the advanced options by clicking it to 'ON' and then pressing Show.

Example of HFO Telecom Inbound routes.


Enter here a name for the according rule.

Date / Weekdays / Time

With these settings you can configure a time-controlled routing to different targets.

Pattern / Target

In the pattern you define which part of the incoming number is used to forward the call to the according extension.

In our example we receive already the correct extension from the gateway group. Therefore no further number-manipulation is necessary.

When the PBX finds an according extension it will route the call to it.

But you can add here exceptions from this rule, for example for internal fax users or waiting queues, etc.

Please have in mind the order of these rules, as the system is using First Match!!!


Outbound routes

In the Gigaset PBX go to "Administration" - "Routes" - "Outbound routes" activate the Advanced options by clicking it to 'ON' and then pressing Show.


Example of HFO Telecom Outbound routes.


Enter here a name for the according rule.

Date / Weekdays / Time

With these settings you can configure a time-controlled routing.


In the pattern you define how the outside line is seized. In our example all dialled numbers starting with '0' will use the Gateway group HFO Telecom.

Remark: For calling anonymous to external parties, use the CLIR-setting in the HOME screen of the user!


Fax support

Following table shows you the current state (01.08.2016) of supported fax constellations. These results are without a guarantee. Due to different end-devices, configuration of PBX or other settings the fax transmission might fail. More info about fax via VoIP networks can be found here.



Internal FXSInternal T38-FaxExternal T38-FaxExternal machine-Fax
Internal FXS------OK*/**OK*/**
Internal T38-Fax------OK**OK**
External T38-FaxOK*OK**------
External machine-FaxOK*OK**------

Used devices or services:

Canon Fax-L100 (internal FXS), www.minifax.de (external SW-Fax), Triumph Adler DCC 2725 (external machine-Fax)

* = T38 option in SIP gateway deactivated

** = T38 option in SIP gateway activated


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