Dialogic 4000 Media Gateway Series, Справочное руководство

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Dialogic® 4000 Media Gateway Series Reference Guide
page 25
Security
You may configure the parameters shown in the graphic and explained below:
Session Timer
You may configure the parameters shown in the graphic and explained below:
Signaling accept level:
This parameter defines, how the call information should be accepted.
To accept
encrypted calls, you need to activate TLS as listen port in the Network Interfaces configuration.
Accept unencrypted calls only : Only signaling sent with TCP or UDP is accepted. Any
encrypted signaling is rejected.
Accept encrypted and unencrypted calls : All calls are accepted, independent from the
encryption mode.
Accept encrypted calls only : Only signaling with TLS is accepted; unencrypted signaling
is rejected.
Accept encrypted call with SIPS URI only : Only signaling encrypted with the URI scheme
secure SIP is accepted. Calls sent with TLS encryption are rejected.
Media security level: The Secure Real-time Transport Protocol (SRTP) authenticates packets and encrypts data and
thus adds security to the voice stream. SRTP should be used together with TLS.
No SRTP : The voice stream is not secured with SRTP.
Offer and accept SRTP : The voice stream is secured with SRTP, if possible.
Require SRTP for encrypted calls : Calls via TLS need to use SRTP, otherwise they are
rejected.
Note: If you select Require SRTP for encrypted calls , calls without SRTP are still allowed
via UDP or TCP, unless Signaling accept level does not allow calls via UDP or TCP.
Use session timer: Activates session monitoring via SIP session timers using the time-out values given here. Refer
to RFC4028 for details.
Interval: If Use session timer is enabled, you may set a time-out in seconds until a call is considered to
be aborted. Refreshes are normally performed after the first half of the interval has elapsed. The
minimum value is 90 seconds. The default value is 600 seconds.
Minimum session
expires: If Use session timer is enabled, you may set a time in seconds between two session refresh
messages that the Diva SIPcontrol software will accept. The minimum value is 90 seconds.