Grandstream Networks HT503 User Manual

 

Grandstream Networks, Inc. 

Page 29 of 38  

 

•  High (initial 200ms, min 40ms, max 600ms) Note: not all vocoders can meet 

the high requirement 

• 

Medium (initial 100ms, min 20ms, max 200ms) 

Low (initial 50ms, min 10ms, max 100ms) 

Secure RTP protocol used for media transmission over VoIP.  Disabled by default.  
Other modes are: enabled but not forced & enabled and forced. 

Dependent on standard phone type (and location). 

 Bellcore/Telcordia, ETSI-FSK, ETSI-DTMF, SIN 227 – BT, & NTT Japan 

A value of level for Caller ID information sent by a FXS port  to phone connected to it. 
(-40 – 0dB.  Default -20dB) 

If set to “Yes”, polarity will be reversed upon call establishment and termination.  
Default is No.  

Set it to “Yes” of the traditional PBX you are using with HT503 uses this method for 
signaling call termination.  Default is No. 

A configurable period of time in which the FXS port will drop off voltage on the line to 
indicate to the local party that the call is disconnected from the remote side. 
(100-10000 ms.  Default 200 ms) 

The time period when the cradle is pressed (Hook Flash) to simulate a FLASH.  Adjust 
this time value to prevent unwanted activation of the Flash/Hold and automatic phone 
ring-back. 

On-hook timing is the minimum time for an on-hook event to be validated. 

Voice path volume adjustment.   

• 

Rx is a gain level for signals transmitted by FXS 

• 

Tx is a gain level for signals received by FXS.   

Default =  0dB for both parameters. Loudest volume: +6dB  Lowest volume:  -6dB. 

User can adjust volume of call on either end using the Rx Gain Level parameter and 
the Tx Gain Level parameter located on the FXS Port Configuration page.  

If call volume is too low when using the FXS port (ie. the ATA is at user site), adjust 
volume using the Rx Gain Level parameter under the FXS Port Configuration page. 

If voice volume is too low at the other end, user may increase the far end volume using 
the Tx Gain Level parameter under the FXS Port Configuration page. 

Default is No. If set to “Yes” LEC will be disabled per call base. Recommended for 
FAX/Data calls. 

This function lets you configure ring or tone frequencies according to preference.  By 
default tones are set to North American frequencies.  Frequencies should be 
configured with known values to avoid high pitch sounds. 

 

When set to “Yes” the FXO port is activated. 

SIP Server’s IP address or Domain name provided by VoIP Service Provider. 

This Field contains the URL or the IP address of a second SIP server, this one will be 
used in case the device looses the connection with the first server. 

Default is no. If set to yes it will register to Primary Server if registration with Failover 
server expires 

IP address or Domain name of Outbound Proxy, or Media Gateway, or Session Border 
Controller.  Used by HT503 for firewall or NAT penetration in different network 
environments.  If symmetric NAT is detected, STUN will not work and ONLY way to 
correct the problem is to use the outbound proxy. 

User can select UDP, TCP or TLS 

This parameter defines whether or not the HT503 NAT traversal mechanism is 
activated.  If set to “Yes” with a STUN server also specified, the HT503 will perform