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HandyTone-496 User Manual Grandstream Networks, Inc.
30
Use Random Port
This parameter, when set to Yes, will force random generation of both the local
SIP and RTP ports. This is usually necessary when multiple HandyTone ATAs
are behind the same NAT.
DTMF Payload
Type
This parameter sets the payload type for DTMF using RFC2833.
Send DTMF
This parameter specifies the mechanism to transmit DTMF digit. There are 3
modes supported: in audio which means DTMF is combined in audio signal
(not very reliable with low-bit-rate codec), via RTP (RFC2833), or via SIP
INFO. Multiple selections of DTMF method are supported.
Send Flash Event
Default is NO. If set to yes, flash will be sent as DTMF event.
Enable Call
Features
Default is No. If set to Yes, Call Forwarding & Do-Not-Disturb are supported
locally
Use Bell-style
3-way Conference
If this parameter is set to “Yes”, user will be able to make Bellcore style 3-way
conference. *23 will be disabled.
Offhook
Auto-Dial
This parameter allows users to configure a User ID or extension number to be
automatically dialed upon offhook. Please note that only the user part of a SIP
address needs to be entered here. The HandyTone ATA 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.
Disable Call
Waiting
Default is No.
NAT Traversal
(STUN)
This parameter defines whether the HandyTone ATA NAT traversal
mechanism will be activated or not. If activated (by choosing “Yes”) and a
STUN server is also specified, then the HandyTone ATA will behave according
to the STUN client specification. Under this mode, the embedded STUN client
inside the HandyTone ATA will attempt to detect if and what type of
firewall/NAT it is sitting behind through communication with the specified
STUN server. If the detected NAT is a Full Cone, Restricted Cone, or a Port-
Restricted Cone, the HandyTone ATA will attempt to use its mapped public IP
address and port in all its SIP and SDP messages. If the NAT Traversal field is
set to “Yes” with no specified STUN server, the HandyTone ATA will
periodically (every 20 seconds or so) send a blank UDP packet (with no
payload data) to the SIP server to keep the “hole” on the NAT open.
No Key Entry
Timeout
Default is 4 seconds.