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Grandstream Networks, Inc. GXP User Manual Page 32 of 38
Firmware 1.1.5.15 Last Updated: 12/2007
Outbound Proxy
IP address or Domain name of Outbound Proxy, Media Gateway, or Session
Border Controller. Used for firewall or NAT penetration in different network
environment. If the system detects symmetric NAT, STUN will not work. ONLY
outbound proxy can provide solution for symmetric NAT.
SIP User ID
User account information provided by VoIP service provider (ITSP); either an
actual phone number or formatted like one.
Authenticate ID
SIP service subscriber’s Authenticate ID used for authentication. It can be
identical to or different from SIP User ID.
Authenticate Password
SIP service subscriber’s account password for GXP to register to (SIP) servers of
ITSP.
Name
SIP service subscriber’s name that is used for Caller ID display.
Use DNS SRV:
Default is No. If set to “Yes”, the client will use DNS SRV to look up server.
User ID is Phone
Number
If the phone has an assigned PSTN telephone number, this field should be set to
“Yes”. Otherwise, set it to “No”. If “Yes” is set, a “user=phone” parameter will be
attached to the “From” header in SIP request
SIP Registration
This parameter controls sending REGISTER messages to the proxy server. The
default setting is “Yes”.
Un-register on Reboot
Default is No. If set to “Yes”, the SIP user’s registration information will be
cleared on reboot.
Register Expiration
This parameter allows user to specify the time frequency (in minutes) that GXP
refreshes its registration with the specified registrar. The default interval is 60
minutes. The maximum interval is 65,535 minutes (about 45 days).
Local SIP Port
This parameter defines the local SIP port used to listen and transmit. The default
value for Account 1 is 5060. It is 5062, 5064, 5066 for Account 2, Account 3 and
Account 4 respectively.
SIP Registration Failure
Retry Wait Time
Retry registration if the process failed. Default is 20 seconds.
SIP T1 Timeout
RFC 3261 SIP T1 timer. Default is 1 second.
SIP T2 Interval
RFC 3261 SIP T2 timer. Default is 0.5 seconds.
SIP Transport
Choose SIP Transport between UDP and TCP. Default is UDP.
Use RFC3581
Symmetric Routing
This option allows a SIP client to request that the server send the response back
to the source IP address and port from which the request originated.
NAT Traversal (STUN)
This parameter activates the NAT traversal mechanism. If activated (by choosing
“Yes”) and a STUN server is also specified, the phone performs according to the
STUN client specification. Using this mode, the embedded STUN client detects if
and what type of NAT/Firewall configuration is used. If the detected NAT is a Full
Cone, Restricted Cone, or a Port-Restricted Cone, the phone will use its mapped
public IP address and port in all of its SIP and SDP messages. If the NAT
Traversal field is set to “Yes” with no specified STUN server, the GXP will
periodically (every 20 seconds or so) send a blank UDP packet (with no payload
data) to the SIP server to keep the “hole” on the NAT open.