Installation guide
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V
OIP RECORDING
16 VoIP Recording
It is possible to record voice calls to a central recording equipment. The
phones that shall have recording are monitored via the CSTA interface
and this means that an Application Link or an Open Application Server
(OAS) must be used to provide the CTI interface to the recording system.
The call events and the IP address to the phones to be monitored are
sent over the CSTA interface.
For more information about the recording solution for MX-ONE Tele-
phony Server see Description for Voice Recording and the Interface
Description for VoIP Recording Interface.
The signalling between the recording system and the IP phones is based
on SIP. The recording system sends an INVITE message to the phone
to inform about the IP address to where the voice packets shall be sent.
A SIP ACK message orders the phone to start forwarding the received
and transmitted RTP streams to the logger.
There are the following options
1. Total recording: the recording system orders the telephone to
start the recording dependent on the recording policy. All calls or
only external calls to the monitored extensions are recorded for
example.
2. Record on demand: the user can start and stop the recording by
pressing the recording key.
Note: It is only possible to record IP phones. No other types of phones
shall be monitored.
The voice stream is sent un-encrypted to the recording equipment, if the
original call is without encryption. If the call is encrypted, the telephone
forwards an encrypted voice stream to the recorder. In this case the
encryption keys are sent via the CSTA interface to the recording equip-
ment.
The icon for recording in the display, is shown when the telephone
forwards the RTP stream to the recording system. Moreover it is
possible to configure the phone to play a periodic beep tone.
16.1 Configuration at Total Recording
The recommendation is to use dynamic recording sessions (i.e. per
call), although it is also possible to use static (i.e. per the duration that
the phone is registered). The type of recording session is configured in
the recording system.