Grandstream Networks HT812 Administration Manual page 27

Actual the permanent listening port on the phone. Otherwise, they will use the ephemeral port for the connection.
Ephemera Default is No.
l Port in
Contact
with
TCP/TLS
Indicates type of NAT for each account. This parameter configures whether the NAT traversal mechanism is
NAT
activated. Users could select the mechanism from No, Keep-alive, STUN, UPnP.
Traversal
Default setting is No.
Selects DNS mode to use for the client to look up server. One mode can be chosen.
A Record (Default): resolves IP Address of target according to domain name.
SRV: DNS SRV resource records indicate how to find services for various protocols.
DNS
NAPTR/SRV: Naming Authority Pointer according to RFC 2915.
Mode
Use Configured IP: If the SIP server is configured as domain name, device will not send DNS queries, but will
use "Primary IP" or "Backup IP" to send SIP message if at least one of them is not empty. It will try to use
"Primary IP" first, after 3 tries without any response, it will switch to "Backup IP 1", then "Backup IP 2", and then
it will switch back to "Primary IP" after 3 retries.
DNS SRV
When the HT81x is registered using the second SRV record, making an outbound call, it will try the second SRV
use
(registered IP) first. By default, this option is disabled and the DNS SRV will use first SRV instead of the
Registere
registered IP.
d IP
Configure the preferred IP mode when DNS Mode is SRV or NAPTR/SRV.
• Default SIP request will always be sent to the address with the top priority based on the SRV query result, even
DNS SRV if this address is different from the registered IP address.
Failover
• Saved one until DNS TTL SIP request will always be sent to the registered IP address until DNS TTL expires or
Mode
registered IP address is unreachable
• Saved on until no response SIP request will always be sent to the registered IP address only until registered IP
address is unreachable.
When the primary SBC is up, device will send SIP requests to the primary SBC. If at any point device fails over to
Failback
the secondary SBC, the SIP requests will stay on the failover SBC for the duration of the failback timer. When
Timer the timer expires, device will send SIP requests to the primary SBC, (in minutes. Default is 60 minutes, max 45
days).
Register
This feature is used to control whether the device need to initiate a new registration request (following existing
before
DNS SRV fail-over mode) first and then direct the non-registration SIP request (INVITE) to the new successfully
DNS SRV
registered server or not.
Failover
Indicates E.164 number in "From" header by adding "User=Phone" parameter or using "Tel:" in SIP packets, if
the HT81x has an assigned PSTN Number.
Disabled: Use "SIP User ID" information in the Request-Line and "From" header.
TEL URI
User=Phone: "User=Phone" parameter will be attached to the Request-Line and "From" header in the SIP
request to indicate the E.164 number. If set to "Enable".
Enabled: "Tel:" will be used instead of "sip:" in the SIP request.
Please consult your carrier before changing this parameter. Default is Disabled.
Use
Request
Routing If set to Yes, device will use the configured [Request URI Routing ID] in the SIP INVITE. This option is usually
ID in SIP used under a SIP trunk account's configuration. Default is No.
INVITE
Header
SIP
Controls whether the HT81x needs to send REGISTER messages to the proxy server. Default setting is Yes.
Registrati
on