User's Manual 162 Document #: LTRT-10532
Mediant 500L Gateway & E-SBC
Period (msec) during which if no packets are received from the current stream, the
channel latches onto the next packet received from any other stream.
Depending on media latch mode, if the device has latched on to a new stream and a
packet from the original (first latched onto) IP address:port is received at any time, the
device latches on to this original stream.
Latching on to a new T.38 stream is reported in CDR using the CDR fields, LatchedT38Ip
(new IP address) and LatchedT38Port (new port). In addition, the SIP PUBLISH message
updates the latched RTP SSRC, for example:
RemoteAddr: IP=10.33.2.55 Port=4000 SSRC=0x66d510ec
To configure media latching:
1. Open the Media Settings page (Setup menu > Signaling & Media tab > Media folder >
Media Settings), and then from the 'Inbound Media Latch Mode' drop-down list
(InboundMediaLatchMode), configure the media latch mode:
Figure 12-10: Configuring Incoming Media Latch Mode
2. If you configure Step 1 to Dynamic or Dynamic-Strict:
• Configure the minimum number of continuous media (RTP, RTCP, SRTP, and
SRTCP) packets that need to be received by the channel before it can latch onto
this new incoming stream:
♦ 'New RTP Stream Packets'
♦ 'New RTCP Stream Packets'
♦ 'New SRTP Stream Packets'
♦ 'New SRTCP Stream Packets'
• Configure a period (msec) after which if no packets are received from the current
media session, the channel can re-latch onto another stream:
♦ 'Timeout To Relatch RTP'
♦ 'Timeout To Relatch SRTP'
♦ 'Timeout To Relatch Silence'
♦ 'Timeout To Relatch RTCP'
♦ 'Fax Relay Rx/Tx Timeout'
Figure 12-11: Configuring Media Robust
3. Click Apply, and then save your settings to flash memory.
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