Topic Last Modified: 2010-11-08
For each call to the PSTN, the Mediation Server determines whether media from the endpoint of origin can be sent directly to a Mediation Server peer without traversing the Mediation Server. The peer can be a PSTN gateway, IP-PBX, or Session Border Controller (SBC) at an Internet telephony service provider (ITSP). For details about defining Mediation Server peers, see Define a Peer of the Mediation Server for a Site in the Deployment documentation.
Media bypass can be employed when the following requirements are met:
- A Mediation Server peer must support the necessary capabilities
for media bypass, the most important being the ability to handle
multiple forked responses (known as “early dialogs”). Contact the
manufacturer of your gateway or PBX, or your ITSP, to obtain the
value for the maximum number of early dialogs that the gateway,
PBX, or SBC can accept.
- The Mediation Server peer must accept media traffic directly
from Lync Server 2010 endpoints. Many ITSPs allow their SBC to
receive traffic only from the Mediation Server. Contact your ITSP
to determine whether its SBC accepts media traffic directly from
Lync Server 2010 endpoints.
- Lync Server 2010 clients and a Mediation Server peer must be
well connected, meaning that they are either located in the same
network region or at network sites that connect to the region over
WAN links that have no bandwidth constraints