350 Matrix ETERNITY NE System Manual
• Select Use Router's Public IP Address, if SARVAM UCS is located behind a NAT Router (any
type).
If you select this option, keep the Outbound Proxy disabled.
• In the No. of Simultaneous Calls list, select the number of simultaneous calls you want to allow on this
SIP Trunk. Default: 8.
The number of simultaneous SIP calls depends on the number of simultaneous calls allowed by the ITSP
with whom you have subscribed this SIP Trunk.
The SARVAM UCS supports 8 simultaneous calls. Ask your ITSP about the number of simultaneous SIP
calls supported on this SIP Trunk. Configure this parameter only if the ITSP supports less than 8
simultaneous calls.
•In Handle rport, select from the following options:
• Force NAT: By default, this option is selected. The system will not check Contact/Via header etc. while
sending SIP messages and will follow Symmetric Signaling.
• RFC 3581: Select this option, if you want the system to follow Standard RFC’s while sending SIP
messages.
Default: Force NAT
• The use of Symmetric RTP makes it possible for a SIP device to send the RTP on the same connection on
which it is listening for RTP. This is done only on peer-to-peer SIP trunks.
Select the Use Symmetric RTP check box, if the SARVAM UCS is located on a public IP and you want
outgoing calls to the SIP Client located behind the NAT Router. OR if you need to receive incoming calls
from the SIP Client located behind the NAT router.
• By default Accept RTP Packets from Random Port is disabled, that is, the System will accept RTP
packets from the negotiated RTP port only.
Enable this check box, if you want the system to accept RTP packets from any random port.
• Accept RTP Packets from Random Port parameter is applicable only if:
• Use Symmetric RTP? is disabled.
• RTP Packets check box in PCAP is disabled. For details, see “PCAP Trace”.
• RTP Mode is set as Transcoding or RTP Relay. For details, see “VoIP Parameters”.
• The System security might be at risk, if you enable this option as packets from all RTP ports are
accepted by the System.
• Select the Default Transport for Outgoing Messages from the following options:
• UDP: Outgoing messages are transported using UDP.
• TCP: Outgoing messages are transported using TCP.
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