The registration tab is used to control the registrations for the account. You may register one or more devices for one extension. When an extension is called, the system will call all registered extensions in parallel. The first extension that picks the call up will get the call, and the other extensions will stop ringing.

• Trusted IP Addresses: This setting dictates which IP address or addresses can be registered to this extension. The system will accept registrations only from the specified IP addresses. For example, if the extension has been set to 192.168.1.2 and 192.168.1.5 tries to register, it will be denied with a 403 forbidden message. Use a space as a separator when entering multiple IP addresses. To indicate subnets, use a slash and the number of significant bits behind it (e.g., 192.168.2.0/24).

• Bind to MAC Address: This field is used to bind the registration to a specific user agent. The MAC address is located on the back of the phones and begins with 0004 for snom phones.

• Parameters 1 through 3: Parameters 1 through 3 allow you to configure fixed values that can be used in conjunction with the “External Voicemail System” setting at the domain level. Without using these parameter settings, using a value of 7$u in the “External Voicemail System” setting tells the PBX to prefix the user name (number) with a “7” before sending it to an external voicemail system. If you prefer to set a fixed value (e.g., 555) for the user name, set one of the parameters to a specific extension (e.g., 555) and link it to the “External Voicemail System” setting by entering 7$1 (if using parameter 1) into the “External Voicemail System” setting. The PBX will then use 7555 for the ANI. These Parameter settings can also be used during the dial plan replacement operation. By default, the PBX uses “\r” in the dial plan replacement to substitute “trunk registrar.” Similarly, you can use “\x” to use the value set in Parameter 1, “\y” to use the value set in Parameter 2, and “\z” to use the value set in Parameter 3.

• EPID: EndPoint Identifier is a random number created by the system and functions as a callback number. The EPID is sent on all 911 calls, enabling the PSAP to call the extension back directly if the phone is disconnected or the person hangs up. The EPID is essentially a DID for that extension and ensures that a returned call will reach the extension from which the call originated even if there is an auto attendant in the middle. This works to enable 911’s E911 service. A general callback number for all users across the domain can also be set using the ANI for emergency setting. (See also Emergency Destination Number on this page, and the Emergency Numbers settings.)

• Lines: The lines parameter is used during provisioning to tell the phone how many line keys it should allocate (whenever applicable). The line feature is also used to restrict the number of calls that an extension can make. For example, if 1 is used in this field, then calls cannot be made simultaneously from both the office phone and the home office phone. During an active call, the system will neither page the extension nor perform intercom calls to that extension.

• Max. number of concurrent registrations per extensions: This setting is used to restricted the number of phones that can be registered to an extension. This is useful for service providers or enterprises that want to ensure only one phone is registered per extension.

• Credit for outbound calls: This setting allows you to place a limit on outbound calling for the extension only. You can also place a limit on outbound calling at the domain level settings.

• Override Codec Preference: This setting allows you to specify the codec preference for the extension. This setting is useful for a remote phone with limited bandwidth, as you can force a low bit rate codec like GSM or G.729 to be used on the extension. The format for this setting is similar to the Port Setup section of the system.

• Emergency Destination Number: This setting is used when you are running the extension in a remote location where a different police department should be called. You will need to find the Public Safety Answering Point (PSAP) for this number; however, it is not a guarantee that a call will be routed there, so ensure that this is tested or approved if your carrier does not have 911 service. Once this setting has been populated, the number entered into this field will be dialed once a user dials an emergency number configured in the Emergency Numbers setting.

• Log Registration Changes: This setting allows the domain administrator to specify a log level for registration log messages specifically for the extension. This setting makes tracking down registration problems easier. You can also decide who should receive an email when the registration status does change—the administrator, the user, or both.

Current Registrations

Displayed at the bottom of the Registrations page are the current registrations (if any exist) for the account. Important information includes the type of registration, the registered contact address (as indicated in the registration message), and the length of time the contact has been registered. “REGISTER” in the Type field indicates a standard registration for receiving calls. Other registrations address specific event types, like message waiting indications.

Clearing registrations: To clear all registrations, use the link at the bottom the page. Be sure to refresh the registration from the user agent so that you are able to call it.

Sending a reboot request: You may also send a reboot request to the phone by clicking the check sync link.

This way, you don’t have to use the web interface of the device or even go to the phone to reboot it (for example, to read new configuration data).

Manual registrations: You can also add a registration manually. Manual registrations are useful for devices like Microsoft speech server that do not support registrations.

Static registrations: Static registrations can be used to call any other number.