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Grandstream Networks, Inc. HT-502 User Manual Page 24 of 35
Firmware 1.0.0.39 Last Updated: 03/2007
work and ONLY outbound proxy can correct the problem.
SIP transport
User can select UDP or TCP or TLS.
NAT Traversal
(STUN)
This parameter defines whether or not the HT–502 NAT traversal mechanism
is activated. If activated (by choosing “Yes”) and a STUN server is also
specified, then the HT–502 performs according to the STUN client
specification. Using this mode, the embedded STUN client will detect if and
what type of firewall/NAT is being used. If the detected NAT is a Full Cone,
Restricted Cone, or a Port-Restricted Cone, the HT–502 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
HT–502 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.
SIP User ID
User account information, provided by VoIP service provider (ITSP). Usually in
the form of digit similar to phone number or actually a phone number.
Authenticate ID
SIP service subscriber’s Authenticate ID used for authentication. Can be
identical to or different from SIP User ID.
Authenticate
Password
SIP service subscriber’s account password.
Name
SIP service subscriber’s name 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 HT–502 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
Controls whether the HT–502 needs to send REGISTER messages to the
proxy server. The default setting is Yes.
Unregister on Reboot
Default is No. If set to Yes, the SIP user’s registration information will be
cleared on reboot.
Outgoing Call w/o
Registration
Default is No. If set to “Yes,” user can place outgoing calls even when not
registered (if allowed by ITSP) but is unable to receive incoming calls.
Register Expiration
This parameter allows the user to specify the time frequency (in minutes) the
HT–502 refreshes its registration with the specified registrar. The default
interval is 60 minutes (or 1 hour). The maximum interval is 65535 minutes
(about 45 days).
Local SIP port
Defines the local SIP port the HT–502 will listen and transmit. The default
value for FXS port 1 is 5060. The default value for FXS port 2 is 5062.
Local RTP port
Defines the local RTP-RTCP port pair the HT–502 will listen and transmit. It is
the base RTP port for channel 0. When configured,
channel 0 uses this port _value for RTP and the port_value+1 for its RTCP;
channel 1 uses port_value+2 for RTP and port_value+3 for its RTCP.
The default value for FXS port 1 is 5004. The default value for FXS port 2 is
5012.
Use Random Port
This parameter forces the random generation of both the local SIP and RTP
ports when set to Yes. This is usually necessary when multiple HT–502 are
behind the same NAT.