Grandstream UCM6510 User Manual - Manual (Page 115)

Firmware Version 1.0.2.5 UCM6510 IP PBX User Manual Page 114 of 313
• 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".
Enable Keep-alive
If enabled, empty SDP packet will be sent to the SIP server periodically to
keep the NAT port open. The default setting is "Yes".
Keep-alive Frequency
Configure the Keep-alive interval (in seconds) to check if the host is up.
The default setting is 60 seconds.
TEL URI
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.
SRTP Enable SRTP for the call. The default setting is disabled.
Fax Mode
Select Fax mode. The default setting is “None”.
• None: Disable Fax.
• Fax Detect: Fax signal from the user/trunk during the call can be
detected and the received Fax will be sent to the Email address
configured for this extension. If no Email address can be found for the
user, the Fax will be sent to the default Email address configured in
Fax setting page under web UI->PBX->Internal Options->Fax/T.38.
Strategy
This option controls how the extension can be used on devices within
different types of network.
 Allow All
Device in any network can register this extension.
 Local Subnet Only
Only the user in specific subnet can register this extension. Up to
three subnet addresses can be specified.
 A Specific IP Address
Only the device on the specific IP address can register this extension.
The default setting is "Allow All".
Codec Preference
Select audio and video codec for the extension. The available codecs are:
PCMU, PCMA, GSM, AAL2-G.726-32, G,726, G.722, G.729, G.723, ILBC,
ADPCM, H.264, H.263 and H.263p.