Yealink VP-2009

IP Video Phone Configuration Using the Web Browser
- 49 -
Parameter
Description
SIP Session Timer
T1
Round trip time (RTT) between the server and the client. If the
network latency is long, set it to a greater value. Details about
RTT are specified in RFC 3261.
Default value: 0.5
SIP Session Timer
T2
Interval between the INVITE response receiving and the
non-INVITE request sending, in seconds. Details about this
parameter are specified in RFC 3261.
Default value: 4
SIP Session Timer
T4
Duration for sending information between the client and the
server. Details about this parameter are specified in RFC 3261.
Default value: 5
DTMF Type
DTMF signal transmission type. The options are as follows:
INBAND: DTMF signals are sent as voice signals.
RFC2833: DTMF signals are transmitted based on Real-time
Transport Protocol (RTP). The header in an RTP packet
indicates transmission of DTMF signals and defines the DTMF
signals.
SIP INFO: DTMF signals are transmitted in SIP INFO
messages. The main defect is that DTMF signals may not be
transmitted at the same time with media packets because SIP
control signaling and media packets are sent separately.
How to INFO DTMF
Method for using SIP INFO to transmit DTMF signals. The
options are as follows:
DTMF-Relay
DTMF
Telephone-Event
DTMF Payload
Payload for using RFC 2833 to transmit DTMF signals.
Value range: 97 to 127
Default value: 101
Min RTP Port
Set the min RTP port.
Max RTP Port
Set the max RTP port.
100 reliable
retransmission
Whether to enable the PRACK function to make the temporary
SIP response (1xx signaling) more reliable. The PRACK
function must be enabled for the PSTN network.
Use Session Timer
Whether to update sessions as scheduled. The IP phone
periodically sends a re-INVITE request to hold a session. The
server uses the re-INVITE request to monitor the session
status. Details about this parameter are specified in RFC 4028.
Session Timer
Interval for updating sessions.
Refresher
Party who updates sessions. The value Uac indicates that the
client updates sessions, and the value Uas indicates that the
server updates sessions.
Subscribe Register
Whether to enable the subscription function for registration.
This parameter is used to monitor account registration when
the IP Multimedia Subsystem (IMS) system is involved.
Subscribe for MWI
Whether to subscribe to the MWI service. The value Enabled
indicates that the IP phone periodically sends subscription
information to the server to update the MWI status.
MWI Subscription
Period
Validity period for the MWI service.
Default value: 3600
H264 Payload
Validity period for the H264.
MPEG4 Payload
Validity period for the MPEG4.
SIP Send MAC
Whether to enable or disable the SIP registration packet
include MAC address.