Grandstream Networks DP720 Administration Manual page 36

Refreshes registration periodically with specified SIP proxy (in minutes). Maximum interval
Register Expiration
is 65535 minutes (about 45 days). Default is 60 minutes (or 1 hour).
SIP Registration Sends re-register request after specific time (in seconds) when registration process fails.
Failure Retry Wait Maximum interval is 3600 seconds (1 hour). Default is 20 seconds.
Time
SIP Registration Sends re-register request after specific time (in seconds) when registration process fails
due to "403 Forbidden". Valid range is 0 to 3600 in second. 0 second means stop retry
Failure Retry Wait
Time upon 403 registration. Default is 1200 seconds.
Forbidden
Reregister Before Sends re-register request after specific time (in seconds) to renew registration before the
Expiration previous registration session expires.
Local SIP Port Defines local port to use by the base for listening and transmitting SIP packets. Default
value for Profile 1 is 5060, 6060 for Profile 2, 7060 for Profile 3 and 8060 for Profile 4.
Controls whether to use configured or random SIP ports. This is usually necessary when
Use Random SIP Port
multiple base stations are behind the same NAT. Default is No.
SIP T1 Timeout Defines T1 timeout value. It is an estimate of the round-trip time between the client and
server transactions. For example, the base station will attempt to send a request to a SIP
server. The time it takes between sending out the request to the point of getting a response
is the SIP T1 timer. If no response is received the timeout is increased to (2*T1) and then
(4*T1). Request re-transmit retries would continue until a maximum amount of time defined
by T2. Default is 0.5 seconds.
SIP T2 Timeout Identifies maximum retransmission interval for non-INVITE requests and INVITE responses.
Retransmitting and doubling of T1 continues until it reaches T2 value.
Default is 4 seconds.
Configures the SIP timer D defined in RFC3261. Range of values 0 – 64. Default is 0.
SIP Timer D
Removes outbound proxy information from "Route" header when sending SIP packets.
Remove OBP from
Route Header Default is No.
Adds "SIP Instance ID" attribute to "Contact" header in REGISTER request as defined in
Support SIP
Instance ID IETF SIP outbound draft. Default is No.
Hold Target Before Sends re-INVITE to hold transfer target before sending REFER message to transferee.
Refer Default is Yes.
Includes target's "Contact" header information in "Refer-To" header when using attended
Refer-To Use Target
Contact transfer. Default is No.
DP750/DP720 Administration Guide
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