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| Variable | Type | Description |
|---|---|---|
| $Extension | String | the handsets extension no. |
| $AsteriskUsername | String | The handset's Asterisk username used to auth the handsets SIP account. |
| $AsteriskPassword | String | The handset's Asterisk password used to auth the handsets SIP account. |
| $Directory | Vector<DirectoryItem> | List of white pages entries. |
| $Handset | Handset | A set of handset properties. |
| $System | SystemVariables | A set of system variables. |
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