| Grandstream Networks, Inc. | ||||
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| NAT Traversal |
| This parameter defines whether the HT386 NAT traversal mechanism will be |
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| activated or not. If activated (by choosing “Yes”) and a STUN server is also |
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| specified, then the HT386 will behave according to the STUN client |
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| specification. Under this mode, the embedded STUN client inside the HT386 |
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| will attempt to detect if and what type of firewall/NAT it is sitting behind |
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| through communication with the specified STUN server. If the detected NAT is |
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| a Full Cone, Restricted Cone, or a |
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| attempt to use its mapped public IP address and port in all of its SIP and SDP |
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| messages. If the NAT Traversal field is set to “Yes” with no specified STUN |
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| server, the HT386 will periodically (every 20 seconds or so) send a blank UDP |
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| packet (with no payload data) to the SIP server to keep the “hole” on the NAT |
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| open. |
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| Preferred Vocoder |
| The HT386 supports 6 different codec types including : |
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| G.711 A/Ulaw，G.723.1, G.726, G.729A/B, iLBC. |
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| A user can configure codecs in a preference list that will be included with the |
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| same preference order in SDP message. |
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| Voice Frames per |
| This field contains the number of voice frames to be transmitted in a single |
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| packet. When setting this value, the user should be aware of the requested |
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| packet time (used in SDP message) as a result of configuring this parameter. |
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| This parameter is associated with the first codec in the above codec Preference |
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| List or the actual used payload type negotiated between the 2 conversation |
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| parties at run time. |
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| e.g., if the first codec is configured as G723 and the “Voice Frames per TX” is |
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| set to be 2, then the “ptime” value in the SDP message of an INVITE request |
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| will be 60ms because each G723 voice frame contains 30ms of audio. |
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| Similarly, if this field is set to be 2 and if the first codec chosen is G729 or |
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| G711 or G726, then the “ptime” value in the SDP message of an INVITE |
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| request will be 20ms. |
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| If the configured voice frames per TX exceeds the maximum allowed value, the |
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| HT386 will use and save the maximum allowed value for the corresponding |
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| first codec choice. The maximum value for PCM is 10(x10ms) frames; for |
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| G726, it is 20 (x10ms) frames; for G723, it is 32 (x30ms) frames; for |
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| G729/G728, 64 (x10ms) and 64 (x2.5ms) frames respectively. Please be careful |
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| when massage those parameters. |
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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 need |
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| to be set. |
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| iLBC payload type: |
| Payload type for iLBC. Default value is 97. The valid range is between 96 and |
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| 127. |
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