NEC UNIVERGE SV9100 Manual page 112

112
A randomly generated password is created per port on the PBX to enhance the security of the system and
minimise the risk or rogue SIP devices registering to the system. These passwords can be changed to
make easier to configure and the password entered in system programming is then required to be entered
in to the SIP device.
Note: If a password is not entered, per extension in the SV9100 system programming the SIP device
will be able to register without a password even if Authentication Mode is enabled.
It is recommended to enter a password for every free extension number that, in theory, could have a
SIP device registered to it. This gives additional security against unsolicited SIP registrations.
It is also recommended to check the Toll Restriction class assigned to each extension number,
whether it has a registered device or not, to make sure is has the correct dialling permissions.
Delete SIP Extension Registration
Before attempting to delete the registration of a SIP extension, the SIP device must be unplugged or
powered off.
Enter Program 90-23-01 (handset programming or Web Pro only), and enter the extension number of the
SIP device. Press 1 and Transfer to delete the registration.
SIP Extension Codec Settings
SIP Extensions can use various CODECs. A CODEC is a standard for converting an analogue signal to
digital. This conversion process is handled by the DSP (Digital Signal Processors) on the GPZ-IPLE card.
Each CODEC has different voice quality and compression properties. The correct choice of CODEC will be
based on the amount of bandwidth available, the amount of calls required and the voice quality required.
Available Codecs for SIP Extensions
· G.711 64Kbps codec MOS 4.4
· G.722 64Kbps codec MOS 4.4
· G.726 32Kbps codec MOS 4.2
· G.729 8Kbps codec MOS 4.0
The bandwidth values quoted for these codecs are for the digitized speech in one direction only. The actual
bandwidth required for a call will depend on many other factors and will be much higher than these figures.
The above MOS values are quoted for ideal network conditions. The value could be lower depending upon
the network performance.
The codec is programmed against a Type (profile). Only one Type (profile) can be set up. The extension is
then assigned to 'Type 1'.
1) Program the codec for each Type using the 'Audio Capability Priority' option in Easy Edit–
Advanced Items/VoIP/Extensions/SIP Extensions/SIP Codec Settings(PRG84-19-28)
2) Assign the Type number as '1' to the extension using the 'Codec Type' option in Easy Edit–
Advanced Items/Extensions/SIP Extensions/SIP Terminal Settings (PRG15-05-15)
Please be aware that this codec selection is only a preferred setting. It is possible that a SIP extension will
use one of the other available codecs depending on the destination of the conversation and also who was
the originating party of the call.