User's Manual 654 Document #: LTRT-10532
Mediant 500L Gateway & E-SBC
Generate RFC 2198 redundant packets (IpProfile_RTPRedundancyDepth parameter).
Determine RTP redundancy support in the RTP redundancy negotiation in SDP
offer/answer (IpProfile_SBCRTPRedundancyBehavior parameter). If not supported,
the device discards RTP redundancy packets (if present) received from or sent to the
SIP entity.
For more information, see the above parameters in ''Configuring IP Profiles'' on page 438.
29.5.6.2 Interworking RTP-RTCP Multiplexing
The device supports interworking of RTP-RTCP multiplexing onto a single, local UDP port
(according to RFC 5761) between SIP entities. Employing IP Profiles, you can configure
RTP multiplexing per SIP entity, using the IPProfile_SBCRTCPMux parameter (see
''Configuring IP Profiles'' on page 438).
29.5.6.3 Interworking RTCP Attribute in SDP
The device supports interworking the RTCP attribute 'a=rtcp' in the SDP between SIP
entities. Employing IP Profiles, you can configure RTCP attribute handling (add, remove or
transparent) per SIP entity, using the IpProfile_SBCSDPHandleRTCPAttribute parameter
(see ''Configuring IP Profiles'' on page 438).
29.5.6.4 Interworking Crypto Lifetime Field
The device supports interworking the lifetime field in the 'a=crypto' attribute of the SDP,
between SIP entities. Employing IP Profiles, you can configure the lifetime field handling
(remove or retain) per SIP entity, using the IpProfile_SBCRemoveCryptoLifetimeInSDP
parameter (see ''Configuring IP Profiles'' on page 438).
29.5.6.5 Interworking Media Security Protocols
The device supports interworking media security protocols for SRTP, between SIP entities.
Employing IP Profiles, you can configure the security protocol (SDES, DTLS or both) per
SIP entity, using the IPProfile_SBCMediaSecurityMethod parameter (see ''Configuring IP
Profiles'' on page 438). For more information on SDES and DTLS, see ''Configuring Media
(SRTP) Security'' on page 216.
29.5.6.6 Interworking ICE Lite for NAT Traversal
The device supports interworking ICE for NAT traversal, between SIP entities. Employing
IP Profiles, you can enable ICE Lite per SIP entity, using the IPProfile_SBCIceMode
parameter (see ''Configuring IP Profiles'' on page 438).
29.6 Limiting SBC Call Duration
You can configure the maximum allowed call duration (in minutes) per SBC call. If an
established call reaches this user-defined limit, the device terminates the call. The feature
ensures that calls are properly terminated, allowing available resources for new calls. The
following procedure describes how to configure the feature for all calls (globally). To
configure the feature per specific calls, use IP Profiles (IpProfile_SBCMaxCallDuration).
To configure maximum call duration:
1. Open the SBC General Settings page (Setup menu > Signaling & Media tab > SBC
folder > SBC General Settings).
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