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| SIP Extension to notify SIP server that the unit is behind the |
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| NAT/Firewall. |
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| Voice Mail User ID |
| When configured, user will be able to dial voice mail server by pressing |
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| “MSG” button. |
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| Send DTMF |
| This parameter specifies the mechanism to transmit DTMF digit. There |
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| are 3 modes supported: in audio which means DTMF is combined in |
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| audio signal (not very reliable with |
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| (RFC2833), or via SIP INFO. |
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| Early Dial |
| Default is No. Use only if proxy supports 484 response. |
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| Dial Plan Prefix |
| Sets the prefix added to each dialed number. |
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| Enable Call |
| Default is No. If set to Yes, Call transfer, Call Forwarding & |
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| Features |
| Disturb are supported locally. |
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| Disable |
| Default is No. If set to Yes, missed calls will not be recorded for your |
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| review. |
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| Session Expiration |
| Grandstream implemented SIP Session Timer. The session timer |
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| extension enables SIP sessions to be periodically “refreshed” via a SIP |
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| request (UPDATE, or |
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| there is no refresh via a UPDATE or |
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| will be terminated. |
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| Session Expiration is the time (in seconds) at which the session is |
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| considered timed out, if no successful session refresh transaction occurs |
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| beforehand. The default value is 180 seconds. |
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| The minimum session expiration (in seconds). The default value is 90 |
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| seconds. |
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| Caller Request |
| If selecting “Yes” the phone will use session timer when it makes |
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| Timer |
| outbound calls if remote party supports session timer. |
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| Callee Request |
| If selecting “Yes” the phone will use session timer when it receives |
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| Timer |
| inbound calls with session timer request. |
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| Force Timer |
| If selecting “Yes” the phone will use session timer even if the remote |
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| party does not support this feature. Selecting “No” will allow the phone |
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| to enable session timer only when the remote party support this feature. |
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| To turn off Session Timer, select “No” for Caller Request Timer, Callee |
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| Request Timer, and Force Timer. |
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| UAC Specify |
| As a Caller, select UAC to use the phone as the refresher, or UAS to use |
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| Refresher |
| the Callee or proxy server as the refresher. |
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