Grandstream Networks GRP26 Series Administration Guide

applied before DNS timeout is reached. If set to “Saved one until no response”,
previous IP will be applied even after DNS timeout until it cannot respond.
● Default
If the option is set with “default”, it will again try to send register messages to one IP at
a time, and the process repeats.
● Saved one until DNS TTL
If the option is set with “Saved one until DNS TTL”, it will send register messages to
the previously registered IP first. If no response, it will try to send one at a time for each
IP. This behavior lasts if DNS TTL (time-to-live) is up.
● Saved one until no responses
If the option is set with “Saved one until no responses”, it will send register messages to
the previously registered IP first, but this behavior will persist until the registered server
does not respond.
Register Before DNS SRV Failover
Indicates whether a REGISTER request will be initiated when a server failover
occurred under DNS SRV mode.
Default setting is No.
Primary IP
Configures the primary IP address where the phone sends DNS query to when “Use
Configured IP” is selected for DNS mode.
Backup IP 1
Configures the backup IP 1 address where the phone sends DNS query to when “Use
Configured IP” is selected for DNS mode.
Backup IP 2
Configures the backup IP 2 address where the phone sends DNS query to when “Use
Configured IP” is selected for DNS mode.
NAT Traversal
Configures whether NAT traversal mechanism is activated. Please refer to user manual
for more details.
If set to “STUN” and STUN server is configured, the phone will route according to the
STUN server. If NAT type is Full Cone, Restricted Cone or Port-Restricted Cone, the
phone will try to use public IP addresses and port number in all the SIP&SDP messages.
The phone will send empty SDP packet to the SIP server periodically to keep the NAT
port open if it is configured to be “Keep-alive”. Configure this to be “No” if an
outbound proxy is used. “STUN” cannot be used if the detected NAT is symmetric
NAT. Set this to “VPN” if OpenVPN is used.
Proxy-Require A SIP Extension to notify the SIP server that the phone is behind a NAT/Firewall.
Use SBC
Configures whether a SBC server is used. Note: If enabled, make sure an outbound
proxy is set up.
Account x 🡪 SIP Settings
Basic Settings
SIP Registration
Selects whether the phone will send SIP Register messages to the proxy/server. The
default setting is “Enabled”.
UNREGISTER on Reboot Allows the SIP user’s registration information to be cleared when the phone reboots.
The SIP REGISTER message will contain “Expires: 0” to unbind the connection. Three
options are available: The default setting is “No”.
● If set to “No”, the phone will not unregister the SIP user’s registration information
before new registration.
● If set to “All”, the SIP user’s registration information will be cleared when the phone
reboots. The SIP Contact header will contain “*” to notify the server to unbind the
connection.

Grandstream Networks GRP26 Series Specifications

General

Brand	Grandstream Networks
Model	GRP26 Series
Category	IP Phone
Language	English