AudioCodes MediaPack 114 Manual de usuario Pagina 357

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Version 5.6 357 November 2008
SIP User's Manual 7. IP Telephony Capabilities
a=sendonly in the SDP according to the parameter HoldFormat.
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 ini file parameter HeldTimeout (refer to ''Supplementary
Services'' on page 138).
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