User Guide

Grandstream Networks, Inc. HT-502 User Manual Page 22 of 31
Firmware 1.0.0.29 Last Updated: 01/2007
It is the base RTP port for channel 0. When configured,
channel 0 uses this port _value for RTP and the port_value+1 for its
RTCP; channel 1 uses port_value+2 for RTP and port_value+3 for its
RTCP.
The default value for FXS port 1 is 5004. The default value for FXS port 2
is 5012.
Use Random Port
This parameter forces the random generation of both the local SIP and
RTP ports when set to Yes. This is usually necessary when multiple HT–
502 are behind the same NAT.
Refer to Use Target
Contact
Used for call transfer, incase server requires this setting.
DTMF Payload Type
Sets the payload type for DTMF using RFC2833.
DTMF in-audio
Send DTMF as inband (in-audio).
DTMF via RFC2833
Send DTMF via RTP (According to RFC 2833).
DTMF via SIP INFO
Send DTMF via SIP INFO message.
Send Flash Event
Default is No. If set to yes, flash will be sent as DTMF event.
Enable Call Features
Default is Yes. Advanced call features and feature codes functions are
supported locally.
Offhook Auto-Dial
This parameter allows users to configure a User ID or extension number to
be automatically dialed upon off-hook. Only the user part of a SIP address
needs is entered here. The HT–502 will automatically append the “@” and
the host portion of the corresponding SIP address.
Proxy-Require
SIP Extension to notify SIP server that the unit is behind the NAT/Firewall.
Use NAT IP
NAT IP address used in SIP/SDP message. Default is blank.
Distinctive Ring Tone
Custom Ring Tone 1 to 3 with associate Caller ID: when selected, if Caller
ID is configured, then the device will ONLY uses this ring tone when the
incoming call is from the Caller ID. System Ring Tone is used for all other
calls. When selected but no Caller ID is configured, the selected ring tone
will be used for all incoming calls.
Disable Call Waiting
Default is No.
Disable Call Waiting
Tone
Default is No.
Ring Timeout
Incoming call will stop ringing when not picked up given a specific period of
time.
No Key Entry Timeout
Default is 4 seconds.
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 is NOT designed to work with and should NOT be enabled for
direct IP-to-IP calling.
Dial Plan Prefix
Sets the prefix added to each dialed number.