Snom 4S manual Snom technology AG

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[ S N O M 4 S N A T F I L T E R ]

•Both http and https as web interface for simple access from any- where on the Internet.

•The filter supports Interactive Connectivity Establishment (ICE). User agents that support this feature will optimize the media path for the shortest possible delay.

•Media relay is established using connection-oriented media. User- agents that are not NAT-aware inherently support this feature. This makes the operation of the NAT filter backward-compatible.

•Call-alive polling. During calls, the filter checks if the call is still alive and terminates the call if this should not be the case. With this fea- ture, charging users for broken calls can be avoided.

•Reliable and unreliable transport layers. The filter supports both UDP and TCP transport layers. Full TLS support will be added soon.

•To and From headers may be changed for calls. The filter talks to a web application server to get this information.

•Application Server Integration. The web application server can also change the request-URI. This makes simple routing possible, which can be used for least cost routing, for example.

•Call Duration Limit. The web application server can define the du- ration of the call. This makes it possible to implement prepaid ser- vices.

•HTTP Registrar. The SBC may convert SIP register requests into HTTP requests and send the response back via SIP. This makes it possible to use the web server as registrar.

•Authentication. The SBC may authenticate incoming requests. It keeps a authentication cache updated by the web server. Trust rela- tionships defined by IP address define exceptions.

•CLIR support. When a request leaves the data center, the SBC can change the From-header of the outgoing request and make it anon- ymous. This way, the caller ID can be hidden.

Usually, the filter acts as stateless proxy. That means, by default it just forwards the packets and does not change the content of the at- tachments or the headers themselves. That means that the filter will not interfere with applications (instant messaging, presence, weather report, etc).

There are three exceptions to this rule:

1.

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Contents Snom 4S NAT Filter Admin Manual Snom 4S NAT Filter Version Table of Contents Snmp Overview Applications FeaturesSnom technology AG Overview NAT Filter and SIP ArchitectureNAT How does NAT work? Signalling SIPSymmetrical RTP Classification of User Agents Media RTPRole of the NAT Filter Probing Media PathsNAT Optimizing the Media Path for SymmetricalRegistering SBC BehaviourRTP Relay Snom technology AG NAT Scaling and RedundancyDetecting the right NAT Filter Non NAT-Aware User Agents Requirements on User AgentsSTUN/ICE-Aware User Agents Defining the Maximum Session Time Architecture Windows InstallationInstallation Snom technology AG Installation Snom technology AG Linux Rpm -ihv snomnatf-2.10.*.rpm Installation Port Binding LoggingStandard Port Random Port Logging System SettingsGeneral Outound Proxy Preparing RecoveryControlling Routing Media PortsPort Budgets Media RelayMultiple 2xx Handling Trusted Addresses ChallengingMaximum Packet Size Connection Oriented Media Silence SuppressionRemoving Headers Web Server Integration Codec ControlClir Addresses Register Timeouts Timeout SettingsCall Timeouts Security Settings Snom technology AG Outbound Proxy List Server Log System InformationTrace Call History Current Ports Memory Statistics Currently Handled UAConfiguration Web Server Integration Interface to the Web Server AuthenticationSnom technology AG Web Server Integration Registration Call Initiation Snom technology AG Call Termination Snom technology AG Web Server Integration Setup of the Tools Setup of the SBCOID Available OIDSnom technology AG Snmp Checklist for Installation Checklist for Installation Reader‘s Feedback Snom technology AG All rights reserved
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