Matrix PRASAR UCS System Manual 369
• Use IP Address fetched using STUN: Select this option, if the WAN Port is located behind a NAT
router other than Symmetric.
• Use Router's Public IP Address: Select this option if the WAN Port is located behind a NAT router
(any type).
• Simultaneous Calls
65
: This parameter is for defining the number of simultaneous calls to be allowed on
the SIP trunk. Default:32.
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.
If the ITSP supports less than 32 simultaneous calls on SIP Trunks, you must program this parameter
accordingly.
• Handle rport: Select the desired option from:
• 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.
By default it is Force NAT.
• Use Symmetric RTP?: 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.
Enable this Check box, if the WAN Port 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, Use of Symmetric RTP is disabled.
• Accept RTP Packets from Random Port: By default, this is disabled, that is, the System will accept RTP
packets from the negotiated RTP port only.
Enable this flag, 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 flag in PCAP is disabled. For details, see “PCAP Trace”.
• RTP Mode is set as Transcoding or RTP Relay. For details, see “Configuring VoIP Parameters”.
• SRTP Mode: PRASAR UCS supports SRTP (Secure Real Time Protocol) for secure conversations over
SIP. The PRASAR UCS supports the following options:
• Disable: PRASAR UCS uses normal RTP for transporting the speech packets.
• Optional: PRASAR UCS uses SRTP for transporting the speech packets. If the remote user does not
support SRTP, PRASAR UCS will use normal RTP for transporting the speech packets.
65. This parameter is only applicable if you have set the RTP Mode as Transcoding in “Configuring VoIP Parameters”. The number of
simultaneous calls supported will depend on the number of Vocoder channels available. The channels supported depends
on the license purchased. For details, refer to Vocoder Channels in “License Management”.
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