Grandstream Networks HT818 Administration Manual page 34

Backup Outbound Configures the backup outbound proxy to be used when the "Outbound Proxy"
Proxy registration fails. By default, this field is left empty.
Prefer Primary If the user configures this option to "Yes", when registration expires, the device will re-
Outbound Proxy
register via primary outbound proxy. By default, this option is disabled.
Allow DHCP Option Configures the HT818 to collect SIP server address from DHCP option 120. Default is No.
120 (override SIP
Server)
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.
SIP URI Scheme Specifies if "sip" or "sips" will be used when TLS/TCP is selected for SIP Transport. The
When Using TLS default setting is "sips".
Use Actual Controls the port information in the Via header and Contact header. If set to "No", these
Ephemeral Port in
port numbers will use the permanent listening port on the phone. Otherwise, they will use
Contact with the ephemeral port for the connection. The default setting is "No".
TCP/TLS
NAT Traversal
Indicates type of NAT for each account. This parameter configures whether the NAT
traversal mechanism is activated. Users could select the mechanism from No, Keep-alive,
STUN, UPnP. Default setting is No.
DNS Mode
Selects DNS mode to use for the client to look up server. One mode can be chosen.
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DNS SRV use
When the HT818 is registered using the second SRV record, making an outbound call,
Registered IP
it will try the second SRV (registered IP) first. By default, this option is disabled, and the
DNS SRV will use first SRV instead of the registered IP.
TEL URI
Indicates E.164 number in "From" header by adding "User=Phone" parameter or using
"Tel:" in SIP packets, if the HT818 has an assigned PSTN Number.
A Record: resolves IP Address of target according to domain name.
SRV: DNS SRV resource records indicate how to find services for various protocols.
NAPTR/SRV: Naming Authority Pointer according to RFC2915.
Use Configured IP: If selected, please fill in Primary IP, Backup IP 1 and Backup
IP 2 to be used for server look up. Default is A Record.
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Disabled: Use "SIP User ID" information in the Request-Line and "From" header.
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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".
HT818 Administration Guide
Version 1.0.9.3
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