Version 6.6
771
October 2014
Installation & Operation Manual
43. Session Border Controller (SBC) Application
According to the above functionalities, the call can be configured to operate in one of
the following modes:
Media Anchoring without Transcoding (Transparent):
RTP traverses the
device with minimal RTP packet changes (no DSP resources required). This is
typically used to solve NAT, firewall, and security issues. In this mode, all the
"audio" coders in the received offer are included in the SBC application outgoing
offer. The Coder Table configuration has no effect on the coders in the outgoing
offer.
Media Anchoring with Transcoding:
RTP traverses the device and each leg
uses a different coder or coder parameters (DSP resources are required).
43.16.1
Media Anchoring without Transcoding (Transparent)
To direct the RTP to flow through the device (for NAT traversal, firewall and security),
all IP address fields in the SDP are modified:
Origin: IP address, session and version id
Session connection attribute ('c=' field)
Media connection attribute ('c=' field)
Media port number
RTCP media attribute IP address and port (if the parameter Enable RTCP
Attribute is set to 1)
Each SBC leg allocates and uses the device's local ports (e.g., for RTP\RTCP\fax).
The local ports are allocated from a Media Realm associated with each SBC leg. SBC
legs are associated with a Media Realm as follows: If the leg's IP Group is configured
with a Media Realm, then this is the associated Media Realm; otherwise, the leg's
SRD Media Realm is the associated one.
Figure
43-9: Example of a SIP call with Media Anchoring without Transcoding
Summary of Contents for Mediant 8000
Page 2: ......
Page 33: ...Part I Hardware Overview This part describes the hardware overview of the Mediant 8000 chassis...
Page 34: ......
Page 90: ......
Page 158: ......
Page 264: ......
Page 546: ......
Page 775: ...Part VI Maintenance This part describes the Mediant 8000 maintenance procedures...
Page 776: ......
Page 834: ......
Page 879: ...Part VIII Appendices This part describes additional Mediant 8000 configuration procedures...
Page 880: ......
Page 924: ...Media Gateway Mediant 8000 www audiocodes com Installation Operation Maintenance Manual...