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Group Services

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Mobile Extension Service

If you frequently travel outside the office, you will generally have a 

GSM mobile phone in addition to your Dialog 4223 Professional 

extension.
Once again, without truly being a group service, the Mobile 

Extension service may be of use to you. Its purpose is to allow 

external users – of GSM mobile phones most particularly – to 

access your company’s network, and thus be able to use the 

system as if they were internal users.
In practice, a Mobile Extension terminal is managed in the same 

way as a dummy internal user associated with the external GSM 

mobile number.
To process these calls, the GSM mobile telephone connects to a 

specific DID number for the facility, which accesses the Mobile 

Extension server.
By connecting through the public ISDN network, the GSM mobile 

telephone is then automatically authenticated by its external calling 

number. By default, authentication can be carried out by manually 

dialling the dummy internal number associated as well as the 

corresponding user’s password.
Once authenticated, the GSM mobile telephone user may call any 

internal or external number, just as if he/she were dialling from the 

internal dummy extension. The user’s identity that is transmitted to 

the called parties is the information for the internal dummy extension.
The mobile GSM telephone user may, in the same way, gain access 

to all telephone services to which the internal dummy extension has 

authorisation to access.
The GSM mobile telephone may also be directly called through the 

number associated with the internal dummy extension. This may 

be used in conjunction with a personal group. However, the GSM 

mobile telephone will still retain its regular number.