Grandstream Networks HT881

SIP Basic Settings
SIP Registration
Controls whether the HT841/HT881 needs to send REGISTER messages to the proxy server. The default
setting is Yes.
SIP Transport
Selects transport protocol for SIP packets; UDP or TCP or TLS. Please make sure your SIP Server or network
environment supports SIP over the selected transport method. Default is UDP.
Unregister On Reboot
Controls whether to clear SIP user’s information by sending un-register request to the proxy server. The un-
registration is performed by sending a REGISTER message with “Expires=0” parameter to the SIP server. This
will unregister the SIP account under the concerned FXS page.Unregister on reboot option can be set to "No",
"All" or "Instance".
1. Set to "No":If the "Unregister on reboot" option is set to "No", it means that the SIP user's information will
not be cleared when the device reboots. In other words, the SIP account will remain registered with the
server even after the device is rebooted.
2. Set to "All":If the "Unregister on reboot" option is set to "All", it means that all SIP accounts associated with
the device will be unregistered when the device reboots. This option clears the SIP user's information for
all the FXS ports on the device.
3. Set to "Instance":If the "Unregister on reboot" option is set to "Instance", it means that only the SIP
account associated with the concerned FXS port will be unregistered when the device reboots. This option
clears the SIP user's information for only the specic FXS port that is affected by the reboot.
Default value is set to "No"
Outgoing Call without Registration
Enables the ability to place outgoing calls even if the account is not registered (if allowed by ITSP); device will
not be able to receive incoming calls. Default is No.
Register Expiration
Refreshes registration periodically with specied SIP proxy (in minutes). Maximum interval is 65535 minutes
(about 45 days).
Default is 60 minutes (or 1 hour).
Reregister before Expiration
Sends re-register request after specic time (in seconds) to renew registration before the previous registration
expires.
SIP Registration Failure Retry Wait
Time
Sends re-register request after specic time (in seconds) when registration process fails. Maximum interval is
3600 seconds (1 hour).
Default is 20 seconds.
SIP Registration Failure Retry Wait
Time upon 403 Forbidden
Sends re-register request after specic time (in seconds) when registration process fails with error 403
Forbidden. Maximum interval is 3600 seconds (1 hour). Default is 1200 seconds.
Enable SIP OPTIONS/NOTIFY Keep
Alive
Enables SIP OPTIONS or SIP NOTIFY to track account registration status so the ATA will send periodic
OPTIONS/NOTIFY message to server to track the connection status with the server.
Default setting is No.
SIP OPTIONS/NOTIFY Keep Alive
Interval
Congures the time interval when the ATA send OPTIONS or NOTIFY message to SIP server. The default
setting is 30 seconds, which means the ATA will send an OPTIONS/NOTIFY message to the server every 30
seconds. The default range is 1-64800.
SIP OPTIONS/NOTIFY Keep Alive
Max Lost
Denes the Number of max lost packets for SIP OPTIONS Keep Alive before re-registration. Between 3-10,
default is 3.
Local SIP Port
Denes local port to use by the HT841/HT881 for listening and transmitting SIP packets. Default value is 6060
Note: The formula of dening the FXO SIP ports is the following: SIP port = Prole’s base SIP port + Port Id * 2,
while the Port Id is dened as follows: FXS = 0, FXO1-8 = 1 – 8 for HT881 and FXO1-4 = 1 – 4 for HT841, in this
case, if we set FXO prole 1 local SIP port to 6060, then FXO1 will use port 6062, FXO2 will use 6064, FXO3 will
use 6066 and so on…
Local RTP Port Denes the local RTP-RTCP port pair the HT841/HT881 will listen and transmit. It is the HT841/HT881 RTP
port for channel 0.