SIP User's Manual
454
Document #: LTRT-12804
Mediant 800 MSBG
IP address 0.0.0.0 as the connection IP address or the string ‘a=inactive’ in the
received Re-INVITE SDP cause the device to enter Hold state and to play the Held
tone (configured in the device) to the PBX/PSTN. If the string ‘a=sendonly’ is received
in the SDP message, the device stops sending RTP packets, but continues to listen to
the incoming RTP packets. Usually, the remote party plays, in this scenario, Music on
Hold (MOH) and the device forwards the MOH to the held party.
Receiving Hold/Retrieve:
When an active call receives a Re-INVITE message with either the IP address 0.0.0.0
or the ‘inactive’ string in SDP, the device stops sending RTP and plays a local Held
tone.
When an active call receives a Re-INVITE message with the ‘sendonly’ string in SDP,
the device stops sending RTP and listens to the remote party. In this mode, it is
expected that on-hold music (or any other hold tone) is played (over IP) by the remote
party.
You can also configure the device to keep a call on-hold for a user-defined time after which
the call is disconnected, using the HeldTimeout parameter.
The device also supports "double call hold" for FXS interfaces where the called party,
which has been placed on-hold by the calling party, can then place the calling party on hold
as well and make a call to another destination. The flowchart below provides an example of
this type of call hold:
Figure
8-32: Double Hold SIP Call Flow
Summary of Contents for Mediant 800 MSBG
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