154 Matrix PRASAR UCS System Manual
To assign direct access to a SIP Trunk, select SIP as Function Type and the desired trunk number from
1 or any other trunk number as Offset.
Click OK, each time you select a Function Type and Offset in the dialog box.
You can reinstate default key assignment any time, by clicking the Default button at the bottom of the
window.
• When you complete assigning functions to keys, close the window.
• If you assign/re-assign functions to the following keys, the Phone will restart:
• Speaker
• Headset
• Ringer
• Acknowledge
• Local Menu
RTP Port
• Define RTP Port:
• RTP Listening Port: This is the port on which the SPARSH VP248 listens for RTP messages over
UDP. This port is also used as the source port for sending RTP packets. This port is also used as the
source port for sending RTP packets to the remote peer. The valid range for this port is 1025-65278.
Default: 8000.
Quality of Service
• Set the SIP Quality of Service (QoS) for SIP signaling as:
• SIP DiffServe/ToS. Valid range is 00 to 63. Default: 26.
OR
• RTP DiffServe/ToS. Valid range is 00 to 63. Default: 46.
NAT Keep Alive
• If the SPARSH VP248 is connected behind a NAT router, configure NAT Keep Alive.
• Select the Enable NAT Keep Alive check box to send Keep Alive messages periodically to refresh the
binding in the NAT router. Default: Disabled.
• Define as Interval (sec), the time period, from 001 to 999 seconds, after which the phone should send
Keep Alive message. Default: 120 seconds.
The time period you define should be less than the binding timer of the router.
Timers
• Set the following Timers to the desired value, where required:
• SIP INVITE Timer (sec): This is the time in seconds that the phone waits for a response from the
called party after sending INVITE message. This timer starts after sending INVITE message to the
called party and stops on receipt of the provisional response or the final response or when the user
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