Media Gateway (MGW)
162
Voice over IP (VoIP)
Allocate this VoIP profile to the desired SIP terminal or to the desired SIP
line / SIP tie line. Please note that any codecs not in the VoIP profile are
filtered out by the Forum 5004/5008/5012 communications system during
codec negotiation.
Voice Activity Detection (VAD)
You can change the codec configuration under
Telephony
:
Extended
:
VoIP
profile
. You can also activate the
Voice Activity Detection
option for one or
more codecs in so doing. If this option is active then pauses in the
conversation will be replaced with empty packets. This can be better
compressed by compression-codecs thus reducing the required bandwidth.
This option must be deactivated if you want to assign the profile to a SIP
trunk and if you have set the G.711 codec.
Note:
If you want to allocate the VoIP profile to a Forum IPhone 512 /
Forum IPhone 545 IP system telephone, the
Voice Activity
Detection
option should be deactivated for all codecs.
Media Gateway (MGW)
The Media Gateway transforms VoIP voice data into PCM audio data. This
function converts voice data between VoIP telephones and all other terminal
types. Without the Media Gateway, VoIP telephones can only exchange call
data directly with other VoIP telephones. Media Gateway functionality is also
required for producing dial tones and making external phone calls with a VoIP
telephone.
A hardware unit (call server or gateway) makes 64 RTP channels available. A
hardware unit makes 8 G.729 channels available (Forum 5012 with audio
processor: 16 G.729 channels).
Audio Processor
An audio processor is available for the Forum 5012. The audio processor
implements additional Media Gateway channels.
Operational information
Each audio processor requires its own IP address. This can either be assigned
statically or obtained via DHCP.
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