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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 Service Node see
Description for Voice Recording and the Interface Description for VoIP Recording Inter-
face.
The signaling 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
• 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.
• 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 moni-
tored.
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 equipment.
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.
Below is an example how to set the parameters in the configuration file:
recorder address1: 192.168.1.20
recorder address2: 192.168.1.21
#recording destination1:
recording destination beep: 0
sip services transport protocol: 1
sip services port: 7300
Recorder addressN specifies the trusted IP addresses corresponding to the recording
system.
Recording destinationN specifies the trusted IP addresses corresponding to the desti-
nation where the RTP/SRTP streams should be sent. If these parameters are left unde-
fined, no authentication checks are performed. This is the case in this example.
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