found page listing source numbers for 3.1 on Avaya's Marketingtools page using google. they could have left some out but who knows..
Source Numbers
This form is used to enter values that have special usages. These are entered by right-clicking on the form and selecting the required option (Add, Edit or Delete).
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V<Callers CLI> = Voicemail Trusted Source
For systems using Voicemail Lite or Voicemail Pro in IP Office mode, strings prefixed with a V indicate numbers from which access to the users mailbox is allowed without requiring entry of the mailbox's voicemail code.
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R<Caller's CLI> = Dial in access
To allow data access only from a specified number prefix the number with a "R", for example R7325551234.
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H<Group Name> = Hunt Group Message Waiting Indication
Allows the user to receive message waiting indication of new group messages. Enter H followed by the group name, for example HMain.
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On suitable display extensions, the hunt group name and number of new messages is displayed. Refer to the appropriate telephone user guide.
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If the user is using Phone Manager, the Messages tab shows the hunt group name and number of new messages.
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If the user is not a member of the group, a voicemail code must be set for the group's mailbox. See Voicemail Code on the Hunt Group | Voicemail tab.
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P<Telephone Number> = Voicemail Callback Number
This entry sets the destination for callback (outbound alert) calls from voicemail. Enter P followed by the telephone number including any necessary external dialing prefix, for example P917325559876. This facility is only available when using Voicemail Pro through which a default Callback or a user specific Callback start point has been configured. Refer to the Voicemail Pro documentation. This feature is separate from voicemail ringback.
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MENULOCALE=
Used to override the system and, if set, user locale settings in order to set the language for display messages sent from the IP Office to an extension. This option can also be used in the source numbers list of a particular user to change just their setting. For valid locales see Supported Country Locales.
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RESERVE_LAST_CA=
Used for users with multiple call appearance buttons. When present, this string stops the users last call appearance button from being used to receive incoming calls. This ensures that the user always has a call appearance button available to make outgoing calls and to initiate transfers and conferences.
Strings beginning with AT can be used with a user called DTEDefault to configure the default settings of the IP Office control unit's DTE port.
There also exist strings that are used with the NoUser user to affect the settings of all users on the IP Office system. For details see The 'No User' User.
