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General Product Description
The IPS supports:
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DDO calls to toplink network
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DDI calls from toplink network
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Calling line identifications – Presentations (CLIP)
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Calling party number display on Dterm
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Session Timer - Send/receive keep alive signals
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Receive fragment packets (max. 3000bytes)
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Fault message registration
o IPS reboot (SIP trunk, MP)
o Link disconnect
o Session timer - timeout
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Alternating routing to PSTN
o When SIP trunk or SIP network is failed, 2000 IPS can reroute the outgoing
call to PSTN.
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Add/delete E.164 "+" sign
o Add "+" sign in front of telephone number (outgoing call)
o Delete "+" sign in front of telephone number (incoming call)
2.7.4.1 SIP Trunk Enhancements (R12.2)
NAT Support
The 2000 IPS SIP trunk supports network configuration via a router with NAT/NAPT
function (NAT: Number Address Translator, NAPT: Number Address Port Translator).
NAT support provides efficient use of global IP addresses and provides better security
that shields internal addresses from the public Internet.
Typically, the 2000 IPS with SIP trunk is on one side of a router with NAT/firewall
function and the SIP server is on the other side. The SIP-trunk has a private IP-address
while the SIP server and the outside of the router have a global IP-address. In the SIP
messages sent and received by 2000 IPS, inside the payload of IP-packets, the source IP
address of the 2000 IPS SIP trunk is indicated. This source address in the SIP message is
processed by the SIP server, therefore it should be a global address that refers to the SIP
trunk. If the source IP address in the SIP message is the private address, correct SIP
communication cannot be established.
The NAT function of the router converts a source IP address in the IP header from private
address to global address, and vice versa, but cannot convert the source IP address in the
message body, so it can not change the SIP messages. In R12.2, the IPS can change the
source IP address in the SIP message from the private IP-address to the global IP-address.
Note: When the NAT function is used, it is necessary to do an inter-working test with
providers and routers beforehand.
RTP Monitoring/Statistics (this is a maintenance function)
The SIP trunk can monitor if RTP packets are correctly received when the SIP trunk call
is being established. If no RTP packets are received for 10 seconds, the SIP trunk
connection can be released and the fault message is stored in the system.
This feature prevents unnecessary channel seizure of the SIP trunk.
NEC Philips Unified Solutions
Reproduction in whole or in part is prohibited without the written consent of the copyright owner.
Sopho 2000IPS
UPD
© NEC Philips Unified Solutions, 2006. All right reserved.
Release 12.2, August 2006
40 of 259
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