7.1.4 Error Messages ............................................................................................................3007.1.5 Restarting the KX-NS1000 ...........................................................................................3027.1.6 Troubleshooting by Error Log .......................................................................................3048 Networking Information .......................................................................3078.1 Information about Using an IP Network ......................................................................3088.1.1 Using a VoIP Network with the PBX .............................................................................3088.1.2 DHCP (Dynamic Host Configuration Protocol) Server .................................................3118.1.3 VLAN (Virtual LAN) ......................................................................................................3128.1.4 Jitter Buffer ...................................................................................................................3138.1.5 Voice Activity Detection (VAD) .....................................................................................3138.1.6 Network Configuration ..................................................................................................3148.1.7 Network Devices ..........................................................................................................3188.1.8 QoS (Quality of Service) ...............................................................................................3198.1.9 Network Time Protocol (NTP) ......................................................................................3208.2 H.323 CO Lines ..............................................................................................................3218.2.1 Avoid Multiple IP Networks ...........................................................................................3218.2.2 Gatekeeper ...................................................................................................................3228.2.3 Bandwidth Assessment ................................................................................................3228.2.4 Virtual VoIP Gateway Card Specifications ...................................................................3258.3 SIP CO Lines ..................................................................................................................3268.3.1 IP Telephony Service ...................................................................................................3268.3.2 SIP Requirements ........................................................................................................3298.3.3 Router Requirements ...................................................................................................3298.3.4 Bandwidth Requirements .............................................................................................3298.3.5 Virtual SIP CO Line Card Specifications ......................................................................3318.4 Types of PBX Networks ................................................................................................3328.4.1 One-look Network .........................................................................................................3328.4.2 One-look Networking Survivability ................................................................................3368.4.3 Information about Slave Units ......................................................................................3438.4.4 H.323 QSIG Network ....................................................................................................3458.4.5 Working with Multiple PBX Networks ...........................................................................3468.5 Port Security ..................................................................................................................3478.6 Built-in Router ...............................................................................................................3518.6.1 Built-in Router Overview ...............................................................................................3518.6.2 WAN Connection ..........................................................................................................3538.6.3 DHCP Relay Agent .......................................................................................................3548.6.4 Dynamic DNS ...............................................................................................................3558.6.5 DNS Client ....................................................................................................................3568.6.6 Protocol Bridge—IPv6 Bridge .......................................................................................3578.6.7 Protocol Bridge—PPPoE Bridge ..................................................................................3578.6.8 MAC Address Clone .....................................................................................................3588.6.9 Routing .........................................................................................................................3598.6.10 Firewall .........................................................................................................................3598.6.11 Firewall—Packet Filtering .............................................................................................3608.6.12 Firewall—Stateful Packet Inspection ............................................................................3618.6.13 Firewall—DoS Protection .............................................................................................3618.6.14 Firewall—Other Security Settings ................................................................................3628.6.15 Dynamic NAPT (IP masquerade) .................................................................................3638.6.16 Static NAPT (Port Forwarding) .....................................................................................3638.6.17 DMZ Host .....................................................................................................................3648.6.18 VoIP Port Dynamic Setting ...........................................................................................3648.6.19 IPsec Pass-through ......................................................................................................3658.6.20 PPTP Pass-through ......................................................................................................3668.6.21 L2TP Pass-through ......................................................................................................366Document Version 2016-03 Installation Manual 19Table of Contents