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| reliability to SIP provisional responses (1xx series). This is very important in |
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| order to support PSTN internetworking. To invoke a reliable provisional |
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| response, the 100rel tag is appended to the value of the required header of |
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| the initial signaling messages. The default setting is No. |
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| SIP Transport |
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| Selects the SIP transport method. There are three types: TCP, UDP and |
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| TLS. |
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| Symmetric RTP |
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| Selects whether or not symmetric RTP is supported. |
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| Support SIP Instance ID |
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| Selects whether or not SIP Instance ID is supported. |
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| Validate | Incoming |
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| This configuration selects whether or not the incoming messages should be |
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| Messages |
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| validated. |
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| SIP T1 Timeout |
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| This configures the timeout period for SIP T1. The default setting is 0.5 |
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| Seconds. |
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| SIP T2 Interval |
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| This configures the time interval for SIP T2. The default setting is 4 seconds. |
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| Remove OBP from route |
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| The SIP Extension notifies the SIP server that it is behind a NAT/firewall. |
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| Account/Codec Settings |
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| Enable Video |
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| DTMF |
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| Assigns the mechanism to send DTMF. There are three supported modes: |
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| in audio (with DTMF as audio signals), through RTP and through SIP INFO. |
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| DTMF Payload Type |
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| Sends DTMF using RFC2833. The default is 101. |
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| Preferred Vocoder |
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| This products supports up to 8 different | Vocoders: including |
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| When this has been configured, the system will select the preferred vocoder |
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| from the list and the same order is sent with the SDP messages. |
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| The user can change the preferred vocoder priority order by toggling with |
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| the up and down buttons. It is recommended to use the default setting |
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| “PCMU”; if other vocoders are chosen, there could be an audio transmission |
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| error. |
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| Preferred Video Codec |
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| Selects the preferred video codec from the available list. It is recommended |
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| to use H.264. |
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| H.264Payload type |
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| Selects the dynamic H.264 codec payload type (ranges from |
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| default setting is 99. |
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| Grandstream Networks, Inc. | GXV3175 USER MANUAL | Page 51 of 119 |
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| FIRMWARE VERSION 1.0.0.32 | Updated : 12/2010 |
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