Pstn Participants; Advanced Conferencing (Mscml); Creating A Conference - AudioCodes Mediant 600 User Manual

User's Manual

33.1.5 PSTN Participants

Adding PSTN participants is done by performing a loopback from the IP side (the device's
IP address is configured in the Outbound IP Routing Table). If the destination phone
number in the incoming call from the PSTN is equal to the Conference Service Identifier
and Unique Conference Identifier, the participant joins the conference.
A PSTN participant uses two DSP channels (caused by the IP loopback).
33.2

Advanced Conferencing (MSCML)

33.2.1 Creating a Conference

The device creates a conference call when the first INVITE is received from the Application
Server (same as NetAnn). The Unique Conference Identifier is used to join participants to
the same conference. This first INVITE must include a <configure_conference> MSCML
request body. If this body is not included, a simple conference is established. This first leg
is the Control Leg, which is different from a regular Participant Leg. The Control Leg is
used to perform operations for the whole conference.
The MSCML response to the first INVITE is sent in the 200 OK SIP response. If no error
occurs, the response is:
<response request="configure_conference" code="200" text="OK"/>.
The <configure_conference> can include the following attributes:

Id: identification number of the MSCML request. This is used to correlate between
MSCML requests and responses.

Reservedtalkers: defines the maximum number of talker legs. As the device does not
support "listener only" legs, this actually sets the maximum number of participants in
the conference. The device reserves this number of participants for the entire duration
of the conference. If a participant leg decides to leave the conference by issuing a
BYE, the resource is not freed, thereby allowing that same leg (or a new one) to join at
any stage.

Reserveconfmedia: determines if Media Services such as Play or Record can be
applied to the conference. If set to Yes, the device reserves the necessary amount of
resources to play an announcement to the whole conference or record the whole
conference. The Application Server can change the value of reserveconfmedia during
an existing conference. By default, reserveconfmedia is set to Yes.
Version 6.6 455
33. Conference Server
Mediant 600 & Mediant 1000