Grandstream Networks HT704 Incoming Invite, Allow Incoming SIP, Messages from SIP, Proxy Only

	incoming INVITE	call will be rejected. If this option is enabled, the device will not be able to make direct
		IP calls.
	Allow Incoming SIP	Default is No. Check the incoming SIP messages. If they don’t come from the SIP
	Messages from SIP	proxy, they will be rejected. If this option is enabled, the device will not be able to make
	Proxy Only	direct IP calls.
	SIP T1 Timeout	T1 is an estimate of the round-trip time between the client and server transactions.
		If the network latency is high, select larger value for more reliable usage. Default is 0.5
		Sec.
	SIP T2 Interval	Maximum retransmission interval for non-INVITE requests and INVITE responses.
		Default is 4 Sec.
	DTMF Payload Type	Sets the payload type for DTMF using RFC2833. Default is 101.
	Preferred DTMF method	The HT70X supports up to 3 different DTMF methods including in-audio, via RTP
		(RFC2833) and via Sip Info using SIP INFO messages. The user can configure DTMF
		method in a priority list.
	Disable DTMF	Default is No. If set to yes, use above DTMF order without negotiation
	Negotiation
	Send Flash Event	Default is No. If set to yes, flash will be sent as DTMF event.
	Enable Call Features	Default is Yes. (If Yes, call features using star codes will be supported locally)
	Offhook Auto-Dial	This parameter allows users to configure a User ID or extension number that is
		automatically dialed when off-hook. Only the user part of a SIP address needs to be
		entered here. The HT70X will automatically append the “@” and the host portion of the
		corresponding SIP address. HT701 and HT702 only
	Offhook Auto-Dial	The auto-dial delay after off hook.
	Delay
	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.
	Use SIP User-Agent	Configurable SIP User-Agent Header.
	Header
	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 using
		the FXS port or Profile. Distinctive ring tones can be configured not only for matching a
		whole number, but also for 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
FIRMWARE VERSION 1.0.3.1			HT70X USER MANUAL	Page 38 of 52