370 Matrix PRASAR UCS System Manual
• Forced: PRASAR UCS uses only SRTP (SAVP) for transporting the speech packets. If the remote
user does not support SRTP, PRASAR UCS will reject incoming calls from and drop outgoing calls
made to such users.
By default, SRTP Mode is Disabled.
• SRTP Media Type: If you select Optional as the SRTP Mode option, you must configure the SRTP Media
Type. You may select AVP or SAVP. By default, AVP is selected as the SRTP Media Type.
• DNS Record Type: Set this parameter as provided to you by your Service Provider. You may select any of
the following options:
• A/AAAA Record: Select this option, if you want PRASAR UCS to send the query to the DNS Server to
fetch the IP Address of the Target Server on which further SIP messages are to be sent.
A Record maps to an IPv4 Address of the Target Server, while AAAA (quad-A) Record maps to an IPv6
Address.
• SRV Record: Select this option, if you want PRASAR UCS to send the SRV query to the DNS Server
to fetch the Destination Port. The system will also make a DNS A query to fetch the IP Address of the
Target Server on which further SIP messages are to be sent.
• NAPTR/SRV Record: Select this option, if you want PRASAR UCS to send queries to the DNS Server
to fetch the Transport, Port and IP Address of the Target Server on which further SIP messages are to
be sent.
By default, A Record is set as the DNS Record Type.
This parameter will be checked when:
• SIP Trunk Mode is configured as Proxy.
• Registrar Server Address is configured as Domain and Outbound Proxy Address is blank OR Registrar
Server Address is configured as Domain/IP Address and Outbound Proxy Address is configured as
Domain.
• Send Re-INVITE over SIP Trunk on Hold: With this parameter you can select whether or not the system
should send Re-INVITE message from the SIP Trunk to the Remote Peer, when an external call over the
SIP Trunk is put on hold by the extension user. Set this parameter as per the requirement of the Remote
Peer. The Remote Peer can be a Proxy Server or a SIP Device.
By default, Send Re-Invite over SIP Trunk on Hold is enabled. For more information see “Call Hold”.
• Delayed Offer: Select this check box to enable, if you want the SIP Trunk to generate INVITE without
SDP. By default it is disabled.
• Display Called Party Number as CLI: If you want PRASAR UCS to display the called party number
received in the INVITE message as the CLI, select the Display Called Party Number as CLI check box. By
default, Display Called Party Number as CLI option is disabled.
This parameter is useful when a single SIP Trunk having DDI Numbers and Operator are shared by more
than one organization. If you enable this option, make sure:
• you configure the names and corresponding numbers of the organizations sharing the SIP Trunk in the
Global Directory of PRASAR UCS.
• the Operator has an Extended IP Phone or a Mobile UC Client.
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