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Firmware version 1.0.0.8 DP715/DP710 User Manual Page 43 of 52
Allow Incoming SIP
Messages from SIP
Proxy Only
Default is No. Check the incoming SIP messages. If they don’t come from the SIP proxy,
they will be rejected. If this option is enabled, the device will not be able to make 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 DP715 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
Negotiation
Default is No. If set to yes, use above DTMF order without negotiation
Send Hook 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)
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
Header
Used to replace the SIP User-Agent Header. Default is NO.
Ring Timeout
Default value is 60 Sec. Incoming call will stop ringing when not picked up given a specific
period of time.
Hunting Group Ring
Timeout
Default value is 20 Sec. If call is not answered within this designated time period, the call
will be forwarded to the next member of a Hunt Group.
Hunting Group Type
Linear, parallel and Shared line.
Linear style will sort the call to the lowest-numbered available line; this is also
called “serial hunting”.
Parallel Style will ring all the handsets on incoming calls.
Shared line Style will ring all the handsets on incoming calls, any handset
member of the same hunt group that try to dial out while there is an ongoing call
it will be automatically conference in the ongoing call.
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.
Use # as Dial Key
Default is Yes. It allows users to configure the “#” key as the “Send” (or “Dial”) key. If set
to “Yes”, “#” will send the number. In this case, this key is essentially equivalent to the
“Dial” key. If set to “No”, this “#” key can be included as part of number.
Dial Plan
Dial Plan Rules:
1. Accepted Digits: 1,2,3,4,5,6,7,8,9,0 , *, #, A,a,B,b,C,c,D,d
2. Grammar: x - any digit from 0-9;
43


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