Voice over IP (VoIP) Media Gateway (MGW)
106
Using the OpenCom 131 no Media Gateway cards can be used. Here only the
software MGW function can be used for VoIP.
The Media Gateway function implemented in system software has the following
limitations:
■ Up to four channels can be used simultaneously.
■ The MGW channels are not compressed, so only the G.711 codec is available.
■ There is no echo suppression.
■ Voice quality may be reduced during high system utilisation.
For optimal call quality and high availability, you should consider using a MGW
interface card (see also MGW Interface Card starting on page 106).
9.2.2 MGW Interface Card
A Media Gateway card (M100-IP) is available for the OpenCom 130 and the
OpenCom 150. This interface card implements eight simultaneously usable Media
Gateway channels.
Technical Data
■ The MGW interface card is connected via the slot to the internal ethernet
Switch. There are no external ports via pressure terminals.
■ With an OpenCom 130 the MGW interface card can be operated in slot 2 or
slot 3.
■ With an OpenCom 150 up to two MGW interface cards can be operated in
slots 3 and 4.
■ The MGW interface card supports: all the codecs, as well as the silence
detection, echo suppression and DTMF tone detection used by VoIP tele-
phones.
■ The MGW interface card can not be operated in a slave system.
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