Reference:Administration/Gateway/Interfaces

The display of the gateway’s configurable interfaces is organised in columns:

• Interface: The name of the interface. Clicking this name opens a popup page, on which all settings can be made. The settings are described in more detail in the following chapter "Administration/Gateway/Interfaces/Interface (ISDN & virtual interfaces)".
• CGPN In, CDPN In, CGPN Out, CDPN Out: Precise details on CGPN In, CDPN In, CGPN Out and CDPN Out mappings are contained in the chapter entitled "Administration/Gateway/Interfaces/CGPN-CDPN Mappings" further down in the text.
• State: The current state of the interface at physical and at protocol level. Possible states are: Up, Down.
• Registration: If a terminal has successfully registered with an ISDN, SIP or virtual interface, then this is indicated in this column through specification of the IP address <Name of the VoIP interface:Call number:IP address>.

Interface (ISDN, SIP & virtual interfaces)

Clicking the name of an interface in the Interface column opens a popup page, on which the interfaces can be individually configured. Like the PBX objects, this popup page also contains standard entry fields that occur, more or less, in all interfaces. These standard fields are:

• Name: The descriptive name of the interface.
• Disable: A checked check box disables the relevant interface.
• Tones: The standard calling tone for the relevant interface is set with the Tones list box.
• Interface Maps: The interface can be configured as a point-to-point connection (Point-to-Point), as a point-to-multipoint connection (Point-to-Multipoint) or manually (Manual) using CGPN/CDPN maps.

See description further down in the text.

• Registration: With the Registration list box, an H.323 registration or a SIP registration can be initiated for ISDN interfaces. The routes to be handled as incoming and outgoing calls on the relevant interface are automatically created here (see "Administration/Gateway/Routes").

ISDN interfaces (PPP, TEL1-4, BRI1-4, PRI1-4)

After selection of an interface map, the relevant section is displayed. If Point-to-Point is selected, the Interface Maps Point-to-Point section is displayed:

• Area Code: The international code (for example, 49).
• Subscriber Number: The local network number (for example, 7031).
• National Prefix: The national prefix (for example, 0).
• International Prefix: The international prefix (for example, 00).

If Trunk Point-to-Multipoint is selected, the Interface Maps Point-to-Multipoint section is displayed:

• MSN1-3 / Ext.: For every ISDN basic access, several call numbers can be configured. The innovaphone gateways support up to three multiple subscriber numbers (MSN1-3), followed by the extension (Ext.), which represents the extension to which the MSN is to be mapped.
• National Prefix: The national prefix (for example, 0).
• International Prefix: The international prefix (for example, 00).

Coder Preferences section:

After selection of a registration method, the Coder Preferences section is displayed together with the relevant Registration section.

The standard entry fields in the Coder Preferences section are:

• Model: The Model list box allows you to select the coder to be used. The coders available for selection are:
  G711A, G711u, G723-53, G729A, G726-32 and XPARENT.
  If the remote VoIP device does not support the set coder, a commonly supported coder is used, unless the Exclusive check box was enabled.
• Frame: Determines the packet size used in transmitting voice data (in ms). Larger packets cause a greater delay in voice data transmission, but cause less load on the network, since the overhead involved in transporting the packets in the network is lower. The higher the packet size used, the lower the bandwidth effectively used.

 Encoding method | Packet size | Bandwidth
 ---------------------------------------------
      G.711       |    30ms     |   77kb
      G.711       |    90ms     |   68kb
 ---------------------------------------------
      G.729       |    30ms     |   21kb
      G.729       |    90ms     |   12kb

• Exclusive: A checked check box enforces the set encoding (Model), regardless of whether it is supported by the remote VoIP device.
• SC: A checked check box enables SC (Silence Compression). With SC, no data is transmitted during pauses in the conversation. This also allows bandwidth to be saved without quality loss.
• Enable T.38: A checked check box enables the T.38 Fax-over-IP protocol. If a fax machine was connected to the relevant interface, then this check box must be enabled; otherwise, fax transmissions are not handled.
• Enable PCM: A checked check box enables the PCM switch (Pulse Code Manipulation). Calls from one interface to another interface are then handled directly over the ISDN PCM bus, which in turn saves DSP channels. This entry field is optional and is displayed only in particular devices.

Registration section:

All non-virtual interfaces additionally have the Registration section after selection of the registration method.

H.323 Registration section

The entry fields for an H.323 registration are:

• Gatekeeper Address (primary): The primary gatekeeper IP address at which the interface is to register. If the primary gatekeeper is located on the same device, the local IP address 127.0.0.1 can also be entered here.
• Gatekeeper Address (secondary): The secondary gatekeeper IP address at which the interface is to register, if registration with the primary gatekeeper fails. If the secondary gatekeeper is located on the same device, the local IP address 127.0.0.1 can likewise be entered here.
• Gatekeeper ID: It is also sufficient to specify only the Gatekeeper ID (see also the chapter entitled "Administration/Gateway/General").
• Name: The unique, descriptive H.323 name of the interface or registration.
• Number: The unique E.164 call number of the interface or registration.
• Password / Retype: The security of the registration can be raised by specifying a password (Password). The password must be confirmed (Retype).
• Supplementary Services (with Feature Codes): A checked check box enables the use of additional features (Feature Codes). See description in the chapter entitled "Administration/Gateway/General".
• Dynamic Group: A dynamic group can be added to the H.323 registration.
  Groups can be configured as static, dynamic-in or dynamic-out. For members of static groups, calls are always signalled. It works differently for members of dynamic groups, which register with or unregister from a group dynamically using a function key (Join Group). The difference between dynamic-in and dynamic-out lies in whether the object is to be contained in the relevant group as standard (in) or not (out).

See also description in the chapter entitled "Administration/PBX/Objects".

• Direct Dial: Using Direct Dial, a call setup to the specified call number is initiated as soon as the handset is picked up. A conceivable scenario would be a lift emergency telephone that is connected with the security control room, for example.
• Locked White List: Here, you can specify a comma-separated list of call numbers that may also be dialled in the case of a locked telephone (for example, emergency services numbers, like 110, 911).

SIP Registration section

The entry fields for a SIP registration are:

• Server Address (primary): The IP address or the proxy server address of the SIP provider (for example sipgate.de, 217.10.79.9), to where the SIP messages (for example, register) are to be sent.
• Server Address (secondary): If the SIP provider has an alternative IP address or proxy server, then it can be entered here. In the event of failure of the primary server (for example, when maintenance is being carried out), the registration is then retained.
• STUN Server: The STUN server name or IP address must be configured if the telephone uses a private IP address, but the SIP server is accessible under a public IP address. The value is given by the SIP provider or administrator (for example, stun.xten.com or 64.69.76.23). You can choose any STUN server; it does not necessarily have to correspond to the one of the SIP provider.
• ID @: Here, you enter the user ID followed by the SIP provider domain name (for example, 8111111e0@sipgate.de).
• Display Name: The name you enter here, which corresponds to the part in front of the @ of the URI, is required for the registration if the number (Account) was not specified (for example, 8111111e0).
• Account: Likewise in this protocol, a call number is required for the registration, which corresponds to the part in front of the @ of the URI (for example, 8111111e0).
• Password / Retype: The password (Password) of the SIP Account must be specified and confirmed (Retype).
• Supplementary Services (with Feature Codes): See entry fields for an H.323 registration.
• Dynamic Group: See entry fields for an H.323 registration.
• Direct Dial: See entry fields for an H.323 registration.
• Locked White List: See entry fields for an H.323 registration.

SIP interfaces (SIP1-4)

In addition to the ISDN interfaces (PPP, TEL1-4, BRI1-4, PRI1-4) and virtual interfaces (TEST, TONE, HTTP), there are also four SIP interfaces (SIP1-4), which can be used to obtain a trunk line from a SIP provider, for example. For a description of the entry fields, please refer to the description of the SIP registration above. There are, however, three further entry fields:

• Name: A descriptive name for the interface.
• Disable: Disables the relevant interface.
• Registration: Corresponds to the Registration entry field of the ISDN interfaces.
  After selection of H.323, the Registration for H.323 section is displayed, enabling registration of a SIP Account with a local PBX (for example, innovaphone PBX).
  After selection of SIP, the Registration for SIP section is displayed, enabling in turn registration with a local SIP PBX (for example, innovaphone PBX).

To obtain a trunk line from a SIP provider, you must proceed as follows:

1. Open one of the four SIP interfaces.
2. Enter SIP Account data (ID, STUN server, Account, password).
3. Under Registrations, link the SIP registration via H.323 to a PBX object of the Trunk type created beforehand (specification of the GK ID or GK address and the H.323 name or E.164 call number is sufficient).
4. Confirm with OK.

A successful registration is displayed in the overview page Administration/Gateway/Interfaces as follows:

State (IP of the SIP provider)	Alias (PBX user object)	Registration (IP of the PBX)
For example, 217.10.79.9 (sipgate.de)	H.323 name:E.164 no. SIPTrunk:8	--> 127.0.0.1

In the example above, the trunk line of the SIP carrier sipgate.de is picked up using the Trunk PBX object with the name SIPTrunk and the call number 8. The dialling of the call number 807031730090 therefore initiates a call at innovaphone AG via the configured SIP carrier.

Virtual interfaces (TEST, TONE, HTTP)

The non-configurable, internal interface TEST is only usable as the destination for a call. If a call is received on this interface, the music on hold contained in the non-volatile memory is played. Incoming calls must be in G.729A or G.723 format; other formats are not supported. Suffix dialling digits are ignored. The internal interface TONE is only usable as the destination for a call. If a call is received on this interface, it is connected and the configured dial tone (Tones) is played. This happens particularly with least-cost-routing scenarios, where the call can only be switched once some of the dialled digits have been analysed. In the meantime, the dial tone is played via the TONE interface. Suffix dialling digits are ignored. The TONE interface can process several calls. The non-configurable, internal interface HTTP is only usable as the destination for a call. If a call is received on this interface, music on hold, an announcement or some other spoken information is played from a Web server. The configuration only makes sense in combination with the innovaphone PBX.

CGPN/CDPN Mappings

For every interface, it is possible to store so-called CGPN In, CDPN In, CGPN Out and CDPN Out mappings (Calling Party Number In, Called Party Number In, Calling Party Number Out, Called Party Number Out), enabling call numbers and call number formats to be adjusted for incoming and outgoing calls. The call number formats are as follows:

Unknown:	Unspecified. Number called in outgoing calls.	u
Subscriber:	Call number in local network. Number called in incoming calls.	s
National:	Call number with area code. Calling number from home country.	n	0
International:	Call number with country code and area code. Calling number from abroad.	i	00
Abbreviated:	Unusual.	a
Network-specific:	Unusual.	x

Clicking the link + or a mapping already created (for example, n->0) opens a popup page, on which the setting for the CGPN In, CDPN In, CGPN Out and CDPN Out mappings can be made:

• CGPN In: Is used to process the calling number of incoming calls.
• CDPN In: Is used to process the called number of incoming calls.
• CGPN Out: Is used to process the calling number of outgoing calls.
• CDPN Out: Is used to process the called number of outgoing calls.

Each mapping can be specified for a particular call number type:

• Unknown: The mapping applies to unknown, external calls.
• ISDN: The mapping applies to external calls.
• Private: The mapping applies to internal calls.