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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 |
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| Secure RTP protocol used for media transmission over VoIP. Disabled by default. |
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| Other modes are: enabled but not forced & enabled and forced. |
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| SLIC Setting |
| Dependent on standard phone type (and location). |
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| Called ID Scheme |
| Bellcore/Telcordia, |
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| Caller ID TX Level (dB) |
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| A value of level for Caller ID information sent by a FXS port to phone connected to it. |
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| Polarity Reversal |
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| If set to “Yes”, polarity will be reversed upon call establishment and termination. |
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| Default is No. |
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| Loop Current Disconnect |
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| Set it to “Yes” of the traditional PBX you are using with HT503 uses this method for |
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| signaling call termination. Default is No. |
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| Loop Current Disconnect |
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| A configurable period of time in which the FXS port will drop off voltage on the line to |
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| Duration |
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| indicate to the local party that the call is disconnected from the remote side. |
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| Hook Flash Timing |
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| The time period when the cradle is pressed (Hook Flash) to simulate a FLASH. Adjust |
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| this time value to prevent unwanted activation of the Flash/Hold and automatic phone |
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| On Hook Timing |
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| Gain |
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| 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 |
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| This function lets you configure ring or tone frequencies according to preference. By |
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| default tones are set to North American frequencies. Frequencies should be |
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| configured with known values to avoid high pitch sounds. |
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TABLE 11: FXO PORT SETTINGS
| Account Active |
| When set to “Yes” the FXO port is activated. |
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| SIP Server |
| SIP Server’s IP address or Domain name provided by VoIP Service Provider. |
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| Failover SIP Server |
| This Field contains the URL or the IP address of a second SIP server, this one will be |
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| used in case the device looses the connection with the first server. |
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| Prefer Primary SIP |
| Default is no. If set to yes it will register to Primary Server if registration with Failover |
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| Server |
| server expires |
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| Outbound Proxy |
| IP address or Domain name of Outbound Proxy, or Media Gateway, or Session Border |
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| Controller. Used by HT503 for firewall or NAT penetration in different network |
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| environments. If symmetric NAT is detected, STUN will not work and ONLY way to |
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| correct the problem is to use the outbound proxy. |
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| SIP Transport |
| User can select UDP, TCP or TLS |
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| NAT Traversal (STUN) |
| This parameter defines whether or not the HT503 NAT traversal mechanism is |
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| activated. If set to “Yes” with a STUN server also specified, the HT503 will perform |
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| Grandstream Networks, Inc. |
| HT503 User Manual | Page 29 of 38 |
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| Firmware 1.0.4.2 | Last Updated: 06/2011 |
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