Table 15: Advanced Settings
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| Admin |
| Administrator password. Only the administrator can access the “Advanced Settings” and |
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| Password |
| “Account Settings” page. Password field is purposely blank for security reasons after |
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| clicking update and saved. The maximum password length is 25 characters. |
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| G723 rate |
| Encoding rate for G723 codec. By default, 6.3kbps rate is set. |
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| iLBC frame size |
| iLBC packet frame size. Default is 20ms. For Asterisk PBX, 30ms might be required. |
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| iLBC payload |
| Payload type for iLBC. Default value is 97. The valid range is between 96 and 127. |
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| type |
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| Silence |
| This controls the silence suppression/VAD feature of the audio codec G.723 and G.729. |
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| Suppression |
| If set to “Yes”, when silence is detected, a small quantity of VAD packets (instead of |
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| audio packets) will be sent during the period of no talking. If set to “No”, this feature is |
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| disabled. |
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| Voice Frames |
| This field contains the number of voice frames to be transmitted in a single Ethernet |
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| packet (be advised the IS limit is based on the maximum size of Ethernet packet is 1500 |
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| byte (or 120kbps)). |
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| When setting this value, be aware of the requested packet time (ptime, used in SDP |
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| message) is a result of configuring this parameter. This parameter is associated with the |
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| first codec in the above codec Preference List or the actual used payload type |
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| negotiated between the 2 conversation parties at run time. e.g., if the first codec is |
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| configured as G.723 and the “Voice Frames per TX” is set to 2, then the “ptime” value in |
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| the SDP message of an INVITE request will be 60ms because each G.723 voice frame |
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| contains 30ms of audio. Similarly, if this field is set to 2 and the first codec is G.729 or |
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| G.711 or G.726, then the “ptime” value in the SDP message of an INVITE request will be |
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| 20ms. |
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| If the configured voice frames per TX exceeds the maximum allowed value, the IP phone |
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| will use and save the maximum allowed value for the corresponding first codec choice. |
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| The maximum value for PCM is 10 (x10ms) frames; for G.726, it is 20 (x10ms) frames; |
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| for G.723, it is 32 (x30ms) frames; for G.729/G.728, 64 (x10ms) and 64 (x2.5ms) frames |
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| respectively. |
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| Please be careful when editing these parameters. Adjusting these parameters will also |
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| change the dynamic jitter buffer. The GXP has a patent dynamic jitter buffer handling |
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| algorithm. The jitter buffer range is 20 ~ 200 ms. |
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| Grandstream recommends using the default settings provided. Grandstream does not |
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| recommend adjusting these parameters if you are an average user. Incorrect settings |
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| will affect the voice quality. | Please refer to the Codec FAQ at |
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| http://www.grandstream.com/faqscodec.html for more technical detail. |
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| Layer 3 QoS |
| This field defines the layer 3 QoS parameter. It is the value used for IP Precedence or |
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| Layer 2 QoS |
| This contains the value used for layer 2 VLAN tag. Default setting is blank. |
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| No Key Entry |
| Default is 4 seconds. |
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| Timeout |
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Grandstream Networks, Inc. | GXP User Manual | Page 28 of 38 |
| Firmware 1.1.5.15 | Last Updated: 12/2007 |