Direct Media - AudioCodes Mediant 1000 User Manual

Interfaces table) is used. The following figure provides an example of SDP handling for a
call between a LAN IP Phone 10.2.2.6 and a remote IP Phone 212.179.1.13 on the WAN.

28.5.2 Direct Media

You can configure the device to allow the media (RTP/SRTP) session to flow directly
between the SIP endpoints, without traversing the device. This is referred to as No Media
Anchoring (also known as Anti-Tromboning or Direct Media). SIP signaling continues to
traverse the device, with minimal intermediation and involvement, to enable certain SBC
capabilities such as routing. By default, the device employs media anchoring, whereby the
media session traverses the device, as described in ''Media Anchoring'' on page 615.
Direct media offers the following benefits:

Saves network bandwidth

Reduces the device's CPU usage (as there is no media handling)

Avoids interference in SDP negotiation and header manipulation on RTP/SRTP
User's Manual
Figure 28-3: SDP Offer/Answer Example
616
Mediant 1000B Gateway & E-SBC
Document #: LTRT-27045