| VAD |
| Default is No. VAD allows detecting the absence of audio and conserve bandwidth by |
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| preventing the transmission of "silent packets" over the network. |
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| Symmetric RTP |
| Default is No. When set to Yes the device will change the destination to send RTP |
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| packets to the source IP address and port of the inbound RTP packet last received by |
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| the device. |
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| Fax Mode |
| T.38 (Auto Detect) FoIP by default, or |
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| Fax Tone Detection |
| Default is Callee. This decides whether Caller, Callee or both sends out the |
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| Mode |
| for T.38 or Fax Pass Through. |
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| Jitter Buffer Type |
| Select either Fixed or Adaptive based on network conditions. |
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| Jitter Buffer Length |
| Select Low, Medium or High based on network conditions. |
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| • High (initial 200ms, min 40ms, max 600ms) Note: not all vocoders can meet |
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| the high requirement |
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| • Medium (initial 100ms, min 20ms, max 200ms) |
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| • Low (initial 50ms, min 10ms, max 100ms) |
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| SRTP Mode |
| This option defines different implementation of support SRTP (squired RTP) |
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| transmission mode. |
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| SLIC Setting |
| Dependent on standard phone type (and location) |
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| Caller ID Scheme |
| Bellcore/Telcordia, |
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| Polarity Reversal |
| Default is No. If set to “Yes”, polarity will be reversed upon call establishment and |
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| termination. |
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| Loop Current |
| Default is No. Set it to Yes if the traditional PBX you are using with HT502 uses this |
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| Disconnect |
| method for signaling call termination. Method initiates short voltage drop on the line |
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| when remote (VoIP) side disconnects an active call. |
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| Loop Current |
| Here can be configured duration of such voltage drop described in topic above. |
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| Disconnect Duration |
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| Hook Flash Timing |
| Time period when the cradle is pressed (Hook Flash) to simulate FLASH. To prevent |
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| unwanted activation of the Flash/Hold and automatic phone |
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| value. |
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| On Hook Timing |
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| Gain |
| Voice path volume adjustment. |
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| • Rx is a gain level for signals transmitted by FXS |
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| • Tx is a gain level for signals received by FXS. |
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| Default = 0dB for both parameters. Loudest volume: +6dB Lowest volume: |
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| User can adjust volume of call on either end using the Rx Gain Level parameter and |
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| the Tx Gain Level parameter located on the FXS Port Configuration page. |
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| If call volume is too low when using the FXS port (ie. the ATA is at user site), adjust |
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| volume using the Rx Gain Level parameter under the FXS Port Configuration page. |
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| If voice volume is too low at the other end, user may increase the far end volume using |
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| the Tx Gain Level parameter under the FXS Port Configuration page. |
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| Disable Line Echo |
| Default is No. If set to “Yes” LEC will be disabled per call base. Recommended for |
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| Canceller (LEC) |
| FAX/Data calls. |
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| Ring Tones |
| This function lets you configure ring tone cadence preferences. User has 10 choices. |
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| The configuration, completed in Distinctive Ring Tones block in the same page, applies |
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| to ring tones cadences configured here. |
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Grandstream Networks, Inc. | Page 28 of 32 | |
| Firmware Version 1.0.4.2 | Last Updated: 06/2011 |
