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VOIspeed Gateway configuration

Gateways represent the entities through which the PBX communicates with the outside world, in other words they represent the interface with the company’s telephone lines. A gateway can be a hardware device physically connected to the company’s telephone lines (ISDN, Analog, GSM), or it can be a VoIP operator. In the VOIspeed Cloud architecture, the hardware gateways (ISDN, GSM, Analog) authenticate themselves on the server as if they were a user, therefore the PBX administration will have to create the authentication credentials

On the gateways representing VoIP operators, however, it is the PBX that authenticates itself to the operator as usual.

Entering the Configuration – Gateway menu, you access the list of existing gateways. The delete, search, edit buttons are used respectively to delete, consult the gateway properties and modify its configurations. To create a new gateway, enter the Configuration – Gateway page and click on the  add32 button. The gateway creation window will appear which, depending on the type, will show some fields or not (see below). Gestione gateway
aggiungi gateway aggiungi gateway2
VoIP gateway
The PBX registers with the operator with the data
of the VoIP
Gateway Hardware account (ISDN, GSM, Analog)
The gateway registers on the PBX, so the account must be created as if it were a PBX user. The same data (username and password) must be specified on the hardware gateway.
Parameter Description
Company It is the current company on which you are working (cannot be changed)
Type Indicates the type of physical interface to which the gateway connects. Precisely:
VOIP: VoIP operators
ISDN: indicates an ISDN gateway on basic access or primary access (eg Mediatrix 440X)
GSM: indicates a GSM gateway (e.g. V-6021, 2N)
Analog Line: indicates a gateway for FXO analog lines (eg Mediatrix C730, Patton 4112)
Enabled Enable or disable gateway from PBX routes (VoIP account registration will be disabled)
Name Gateway name (required)
Linee Number of total lines that the gateway can manage. Indicate the exact number of channels or lines available on the gateway. Examples:
ISDN: 2 lines for each basic BRI access (ISDN socket, or ISDN port of a router if provided by another operator)
ISDN: 30 lines for whole primary accesses, 15 for fractional primary accesses
GSM: 1 line for each SIM inserted in the gateway
Analogue Line: 1 line
VoIP: varies according to the case. Enter the number of lines available calculated on the basis of the available Upload bandwidth (each conversation with the G.729 compressed codec occupies approximately 20kbps, each conversation in uncompressed G.711a format occupies approximately 80kbps). If the operator places a constraint on the number of lines, set the same number, as long as it is compatible with your ADSL connection.
Number of
Allows you to specify the exit number (CLID or caller ID) when the gateway uses the telephone line. This allows you to appear outside with the desired number, as long as the gateway being queried supports this function. The available options are:

    • Username (provided by the operator): the username used to create the gateway is used
    • Static: enter the telephone number that you want to display at the output.
      N.B. Italian law prohibits the use of any numbers. Only numbers belonging to your own telephone line are allowed. In the event of an error, the number entered will be ignored in favor of the geographic number (as happens in a Telecom digital line) or the call will even be rejected (for example by VoIP operators).
    • Premises platform, it implicitly indicates the exit number of the extension specified in the user profile. In the UCloud platform it is used instead to view the number of the original external call when an incoming call is forwarded back to the outside.
      N.B. As above, the number in question must be the geographical number provided by the operator and / or attested on their account. It can also be a number other than this, but this number will actually be displayed only if the operator used allows it. As it is forbidden to show a number other than your own line in Italy, this option is only valid abroad in countries where this limitation does not exist.
  • User exit number: in this case the exit number used will be the one set in the user profile
    • Alternative number (if the caller is not a user): used to specify the exit number when the caller is not a user (for example for forwarding by the IVR or forwarding an external call)
Domain Indicates the domain of the VoIP operator (eg.
User ID
In the UCloud architecture, the hardware gateways (ISDN, GSM, Analog) all require authentication such as if they were a user. For this reason, the account (username and password) must be created here.
Warning, do not use characters in this field. Set the telephone number of the telephone line as the User ID. If you have multiple gateawy with the same number, use a different number (for example the main number with one more digit). This new number must obviously be entered as a company number
RTP flow tracker Valido solo per Operatori VoIP: di default è sempre disattivato e va attivato solamente se l’operatore VoIP supporta le comunicazioni peer to peer tra terminali, dove il PBX non fa da bypass sui flussi RTP
Indicates whether the gateway requires authentication or not. It is normally used for VoIP operators. Furthermore, in the UCloud architecture, all gateways (eg GSM, FXO, ISDN) require registration. Activating this option you will be asked: realm, username, password and authentication period (register timeout).
Tip: set the telephone number of the telephone line as username.
Realm Very important for VoIP operators: it must coincide with the Realm communicated by the operator. In case of failure to register, check the Realm column in the gateway monitoring: that represents the true expected value, taken from the PBX from the operator’s response SIP packets. Sometimes the commercial offices of the operators account data incorrect (among these the Realm is the most susceptible to errors).

Notes on authentication parameters: due to the irreversibility of the MD5 encryption operations used in the SIP authentication process, if you decide to change any of the parameters of the triplet of this section (username, realm and password), you will need to re-enter them all how many.


In this section, you can manage the addition / removal of prefixes to / from numbers after being taken over by the gateway. The Prefix Rules field allows you to enter rules for adding or removing the desired prefixes. It is possible to insert more than one rule (one per line) and each of them must have the following syntax:

P1, P2, P3 where P1 = prefix of the called number, P2 = prefix to be removed, P3 = prefix to be added. The comma is considered as a separator, so if there is no prefix to add or remove, you don’t need to write anything, but leave the comma as a separator.


This function is very useful when you want to bind the gateway by prefixing the number dialed: after the call is handled by the gateway, the prefix must be removed otherwise the call would be forwarded to the gateway for a non-existent number.

Example: to exit with the desired operator, the user must prefix the prefix 51 to the number to call (eg: 510612345678). In the Advanced section of the Gateway, enter the rule 51.51, (leaving the last field with the last comma that identifies the last field as empty). This means that calls for numbers starting with 51 will be transformed into calls for numbers without the same prefix.

It is also possible to have the gateway add a prefix to the numbers entered by users because, for example, it refers to a SIP device (eg GSM / UMTS multi SIM gateway) which routes calls to its resources based on a prefix.

Example: the user must exit the SIM 1 of a GSM gateway in a transparent manner when calling mobile phones; the GSM gateway uses the prefix 5 to bind SIM1 (which it then removes internally). In the advanced section of the gateway it will be necessary to enter the following string: 3,, 5 which indicates that to the mobile numbers (prefix 3 …), VOIspeed will add the prefix 5 and send it to the GSM gateway as 53 … The GSM gateway must therefore take care of the removal of the prefix 5 once it has engaged the desired SIM.

NOTE: for convenience numbers to be sent to the gateway, a routing rule must also be created for that prefix, otherwise the PBX would not be able to route the call to the gateway. In fact, these rules apply only AFTER the call has been routed to the gateway itself.