Grandstream Networks UCM6510 IP PBX User Manual page 110

Verification
SIP Settings
NAT
Can Reinvite
DTMF Mode
Insecure
Enable Keep-alive
Keep-alive Frequency
TEL URI
Other Settings
SRTP
Fax Detection
Firmware Version 1.0.1.12
If enabled, this would allow one-button voicemail access. By default this
option is disabled.
Use NAT when the PBX is on a public IP communicating with devices
hidden behind NAT (e.g., broadband router). If there is one-way audio
issue, usually it's related to NAT configuration or Firewall's support of SIP
and RTP ports. The default setting is enabled.
By default, the PBX will route the media steams from SIP endpoints
through itself. If enabled, the PBX will attempt to negotiate with the
endpoints to route the media stream directly. It is not always possible for
the PBX to negotiate endpoint-to-endpoint media routing. The default
setting is "No".
Select DTMF mode for the user to send DTMF. The default setting is
"RFC2833". If "Info" is selected, SIP INFO message will be used. If
"Inband" is selected, 64-kbit codec PCMU and PCMA are required. When
"Auto" is selected, RFC2833 will be used if offered, otherwise "Inband" will
be used.

Port: Allow peers matching by IP address without matching port
number.

Very: Allow peers matching by IP address without matching port
number. Also, authentication of incoming INVITE messages is not
required.

No: Normal IP-based peers matching and authentication of incoming
INVITE.
The default setting is "Port".
If enabled, empty SDP packet will be sent to the SIP server periodically to
keep the NAT port open. The default setting is "Yes".
Configure the number of seconds for the host to be up for Keep-alive. The
default setting is 60 seconds.
If the end device/phone has an assigned PSTN telephone number, this
field should be set to "User=Phone". Then a "User=Phone" parameter will
be attached to the Request-Line and TO header in the SIP request to
indicate the E.164 number. If set to "Enable", "Tel:" will be used instead of
"SIP:" in the SIP request. The default setting is disabled.
Enable SRTP for the call. The default setting is "No".
Enable to detect Fax signal from the user/trunk during the call and send
the received Fax to the Email address configured for this extension. If no
UCM6510 IP PBX User Manual Page 108 of 277