SonicWALL 5.8.1 Manuale Utente

Configurable inactivity timeouts for signaling and media - In order to ensure that 
dropped VoIP connections do not stay open indefinitely, SonicOS monitors the usage of 
signaling and media streams associated with a VoIP session. Streams that are idle for more 
than the configured timeout are shut down to prevent potential security holes.

SonicOS allows the administrator to control incoming calls - By requiring that all 
incoming calls are authorized and authenticated by the H.323 Gatekeeper or SIP Proxy, 
SonicOS can block unauthorized and spam calls. This allows the administrator to be sure 
that the VoIP network is being used only for those calls authorized by the company.

Comprehensive monitoring and reporting - For all supported VoIP protocols, SonicOS 
offers extensive monitoring and troubleshooting tools:

Dynamic live reporting of active VoIP calls, indicating the caller and called parties, and 
bandwidth used.

Audit logs of all VoIP calls, indicating caller and called parties, call duration, and total 
bandwidth used. Logging of abnormal packets seen (such as a bad response) with 
details of the parties involved and condition seen.

Detailed syslog reports and ViewPoint reports for VoIP signaling and media streams. 
SonicWALL ViewPoint is a Web-based graphical reporting tool that provides detailed 
and comprehensive reports of your security and network activities based on syslog data 
streams received from the firewall. Reports can be generated about virtually any aspect 
of firewall activity, including individual user or group usage patterns and events on 
specific firewalls or groups of firewalls, types and times of attacks, resource 
consumption and constraints, etc.

SonicWALL security appliances support transformations for the following protocols.

SonicOS provides the following support for H.323:

VoIP devices running all versions of H.323 (currently 1 through to 5) are supported

Microsoft's LDAP-based Internet Locator Service (ILS)

Discovery of the Gatekeeper by LAN H.323 terminals using multicast

Stateful monitoring and processing of Gatekeeper registration, admission, and status 
(RAS) messages

Support for H.323 terminals that use encryption for the media streams

DHCP Option 150. The SonicWALL DHCP Server can be configured to return the address 
of a VoIP specific TFTP server to DHCP clients

In addition to H.323 support, SonicOS supports VoIP devices using the following additional 
ITU standards:

T.120 for application sharing, electronic white-boarding, file exchange, and chat

H.239 to allow multiple channels for delivering audio, video and data

H.281 for Far End Camera Control (FECC)

SonicOS provides the following support for SIP:

Base SIP standard (both RFC 2543 and RFC 3261)