AudioCodes Mediant 1000B User Manual page 597

User's Manual
Direct media is typically implemented for calls between users located in the same LAN or
domain, and where NAT traversal is not required and other media handling features such
as media transcoding is not required. The following figure provides an example of direct
media between LAN IP phones, while SIP signaling continues to traverse the device
between LAN IP phones and the hosted WAN IP-PBX.
Figure 28-4: Direct Media where only Signaling Traverses Device

To enable direct media:

For all calls: Use the global parameter, SBCDirectMedia (overrides all other direct
media configuration).

For specific calls:
•
SIP Interface: You can enable direct media per SIP Interface (in the SIP Interface
table), whereby calls (source and destination) associated with this same SIP
Interface are handled as direct media calls. The SIP Interface can also enable
direct media for users located behind the same NAT. For more information, see
'Configuring SIP Interfaces' on page 329.
•
Direct Media Tag: You can enable direct media between users that are
configured with the same Direct Media tag value. The tag is configured using the
IP Profile table's IPProfile_SBCDirectMediaTag parameter (see 'Configuring IP
Profiles' on page 385).
The device employs direct media between endpoints under the following configuration
conditions (listed in chronological order):
1. Direct media is enabled by the global parameter (SBCDirectMedia).
2. IP Groups of the endpoints are associated with IP Profiles whose 'Direct Media Tag'
parameter has the same value (non-empty value).
3. IP Groups of the endpoints have the 'SBC Operation Mode' parameter set to Microsoft
Server (direct media is required in the Lync environment). For more information, see
'Configuring IP Groups' on page 336.
4. IP Groups of the endpoints use the same SIP Interface and the SIP Interface's 'SBC
Version 7.0 597 Mediant 1000B Gateway and E- SBC
28. SBC Overview