
| Grandstream Networks, Inc. | 
| *70 | Disable Call Waiting. (Per Call) | 
| *71 | Enable Call Waiting (Per Call) | 
| *72 | Unconditional Call Forward. | 
| 
 | To use this feature, dial “*72”, wait for the dial tone. | 
| 
 | Then dial the forward number, wait for dial tone, hang | 
| 
 | up. | 
| *73 | Cancel Unconditional Call Forward | 
| 
 | To cancel “Unconditional Call Forward”, dial “*73” | 
| 
 | and get the dial tone, then hang up. | 
| *90 | Busy Call Forward | 
| 
 | To use this feature, dial “*90”, wait for the dial tone. | 
| 
 | Then dial the forward number, wait for dial tone and | 
| 
 | hang up. | 
| *91 | Cancel Busy Call Forward | 
| 
 | To cancel “Busy Call Forward”, dial “*91” and get the | 
| 
 | dial tone, then hang up | 
| *92 | Delayed Call Forward | 
| 
 | To use this feature, dial “*92”, wait for the dial tone. | 
| 
 | Then dial the forward number, wait for dial tone, hang | 
| 
 | up. | 
| *93 | Cancel Delayed Call Forward | 
| 
 | To cancel this Forward, dial “*93” and get the dial | 
| 
 | tone, then hang up | 
| Flash/Hook | When in conversation, this action will switch to the | 
| 
 | new incoming call if user heard the call waiting sound. | 
| 
 | When in conversation and no incoming call heard, this | 
| 
 | action will switch to a new channel for a new call. | 
5.4PSTN Pass Through/Life Line
When 
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