11.2.5.1 One VoIP Interface for All Applications ................................................. 113
11.2.5.2 VoIP Interface per Application Type ...................................................... 114
11.2.5.3 VoIP Interfaces for Combined Application Types ................................. 115
11.2.5.4 VoIP Interfaces with Multiple Default Gateways ................................... 115
11.3 Configuring the IP Routing Table ......................................................................... 116
11.3.1 Interface Column ...................................................................................................118
11.3.2 Routing Table Configuration Summary and Guidelines ........................................118
11.3.3 Troubleshooting the Routing Table .......................................................................118
11.4 Configuring Quality of Service .............................................................................. 119
11.5 Disabling ICMP Redirect Messages ..................................................................... 121
11.6 DNS ...................................................................................................................... 121
11.6.1 Configuring the Internal DNS Table .......................................................................121
11.6.2 Configuring the Internal SRV Table .......................................................................123
11.7 Configuring NFS Settings ..................................................................................... 124
11.8 Network Address Translation Support ................................................................. 126
11.8.1 Device Located behind NAT ..................................................................................126
11.8.1.1 Configuring STUN ................................................................................. 127
11.8.1.2 Configuring a Static NAT IP Address for All Interfaces ......................... 128
11.8.2 Remote UA behind NAT ........................................................................................129
11.8.2.1 First Incoming Packet Mechanism ........................................................ 129
11.8.2.2 No-Op Packets ...................................................................................... 129
11.9 Robust Receipt of Media Streams ....................................................................... 130
11.10 Multiple Routers Support ...................................................................................... 130
11.11 IP Multicasting ...................................................................................................... 130
12 Security ............................................................................................................ 131
12.1 Configuring Firewall Settings ............................................................................... 131
12.2 Configuring 802.1x Settings ................................................................................. 135
12.3 Configuring General Security Settings ................................................................. 136
12.4 Configuring IP Security Proposal Table ............................................................... 136
12.5 Configuring IP Security Associations Table ......................................................... 138
13 Media ................................................................................................................ 140
13.1 Configuring Voice Settings ................................................................................... 141
13.1.1 Configuring Voice Gain (Volume) Control .............................................................141
13.1.2 Silence Suppression (Compression) .....................................................................142
13.1.3 Echo Cancellation ..................................................................................................142
13.2 Fax and Modem Capabilities ................................................................................ 144
13.2.1 Fax/Modem Operating Modes ...............................................................................145
13.2.2 Fax/Modem Transport Modes ...............................................................................145
13.2.2.1 T.38 Fax Relay Mode ............................................................................ 145
13.2.2.2 G.711 Fax / Modem Transport Mode .................................................... 147
13.2.2.3 Fax Fallback .......................................................................................... 147
13.2.2.4 Fax/Modem Bypass Mode .................................................................... 148
13.2.2.5 Fax / Modem NSE Mode ....................................................................... 149
13.2.2.6 Fax / Modem Transparent with Events Mode ....................................... 150
13.2.2.7 Fax / Modem Transparent Mode ........................................................... 150
13.2.2.8 RFC 2833 ANS Report upon Fax/Modem Detection ............................ 151
13.2.3 V.34 Fax Support ...................................................................................................152
13.2.3.1 Bypass Mechanism for V.34 Fax Transmission .................................... 152
13.2.3.2 Relay Mode for T.30 and V.34 Faxes ................................................... 152
13.2.4 V.152 Support ........................................................................................................153
13.2.5 Fax Transmission behind NAT ..............................................................................154
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