User's Manual
FIRMWARE VERSION 1.0.7.6    HT502 USER MANUAL     Page 38 of 48  
matching prefixes. In this case symbol * (star) will be used. 
For example: 
 if configured as *617, Ring Tone 1 will be used in case of call arrived from the area 
code 617. Any other incoming call will ring using cadence defined in parameter System 
Ring Cadence located under Advanced Settings Configuration page. 
Note: If server supports Alert-Info header and standard ring tone set (Bellcore) or 
distinctive ring tone 1-10 is specified, then the ring tone in the Alert-Info header from 
server will be used. Bellcore rings and tones are independent from custom ring tones. 
The custom ring tones can also be specified by alert-info header, for example 
Alert-Info: <http://127.0.0.1>;info=ring5 
Disable Call Waiting  Default is No. If set to YES Call Waiting indication information will not be provided to 
analog phone connected to this FXS port.  
Disable Call-Waiting 
Caller ID 
Default is No. If set to YES Call Waiting caller ID will not be provided to analog phone 
connected to this FXS port. 
Disable Call Waiting 
Tone 
Default is No. This is to disable the stutter Call Waiting Tone when a Call Waiting 
information arrives. The CWCID information will still be displayed. 
Disable Reminder Ring 
for On-Hold Call 
Default is No. Do not play the reminder ring when this is set to Yes. 
Disable Visual MWI  If set to “Yes”, the MWI information will not be transferred to the analog phone 
connected to the FXS port. 
Ring Timeout 
Incoming call will stop ringing when not picked up given a specific period of time. 
Delayed Call Forward 
Wait Time 
Default value is 20 seconds. In case this feature activated using * codes (*92 code), the 
call will be forwarded after this preconfigured amount of time. 
No Key Entry Timeout  Default is 4 seconds. Dialing process is completed and outgoing call is initiated if no 
key entry occurs during this preconfigured interval. 
Early Dial  Default is No. Use only if proxy supports 484 response. This parameter controls 
whether the phone will send an early INVITE each time a key is pressed when a user 
dials a number. If set to “Yes”, an INVITE is sent using the dial-number collected thus 
far; Otherwise, no INVITE is sent until the “(Re-)Dial” button is pressed or after about 5 
seconds have elapsed if the user forgets to press the “Re-Dial” button. 
The “Yes” option should be used ONLY if there is a SIP proxy configured and the proxy 
server supports 484 Incomplete Address response. Otherwise, the call will likely be 
rejected by the proxy (with a 404 Not Found error). 
This feature does NOT work with and should NOT be enabled for direct IP-to-IP calling.
Dial Plan Prefix 
Sets the prefix added to each dialed number. 










