Connecting An Analogue Call Recorder; Sip Trunk Recording - NEC Univerge SV9100 Installation Manual

Connecting an Analogue Call recorder

The Analogue call recorder has a different power supply to the other call recording units, ensure that
the correct power supply is attached to the analogue call recording box. The analogue call recorder
wiring should be connected by tapping into the line and presenting the two wires to an RJ45 socket on
the front of the call recording unit. A lead is provided that will connect from a standard LJU (BT Style)
socket to the front of the call recording unit. The BT socket is also re-presented so that the line can be
connected to a PBX.
The image below shows a standard LJU socket with the supplied lead connecting from the LJU to the
call recording unit. The socket indicated by the red arrow is the socket that can be connected to the
PBX. This will need repeating for each line that will be recorded.
Should the cables that are provided not be suitable then the two wires provided by the carrier will need
to be connected to pins 4 and 5 of an RJ45 socket that is connected to the front of the call recording
unit.

SIP Trunk Recording

SIP trunk recording doesn't require any physical hardware to be installed, it instead uses packet sniffing
technology to record calls. Both G.711 and G.729A codes are supported for SIP recording, other
codecs can't be recorded. A port mirror from a network device carrying the SIP trunk calls has to be
connected to a network card in the call recording server. The network card in the call recording that will
perform the packet sniffing must support promiscuous mode. Promiscuous mode will allow a network
card to pass packets that are not addressed to it allowing the calls to be recorded. Depending on the
device performing the port mirror, it may be necessary to have a second card in the call recording server
to capture the SIP packets.
The port mirror can be placed in two different locations depending on the configuration of the network
and how the IP trunks are presented to the PBX. If there is a dedicated internet circuit provided for the
SIP trunks, then the port mirror would be best placed on the port up linking the router to the LAN.
The port mirror can also be placed in-line with the IPL card of the PBX, this will capture all traffic passing
through the IPL. The only drawback to using this method is that IP extension calls will be recorded too.
As MyCalls doesn't report on internal calls then any internal calls can't be played back using MyCalls.
This would also mean if an IP extension made a call on an SIP trunk there would be two calls recorded.
11 | P a g e