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Page 37
InnoMedia MTA8328-1 Administrative Guide
Field Name
Description
Media Port Start
The lowest RTP port number to be used
when sending RTP traffic – It must be an
even number.
Media Port End
The highest RTP port number to be used
when receiving RTP traffic – It must be an
odd number.
4.3.2
Regional Setting
The MTA device connects your analog phone to its FXS (Foreign eXchange Subscriber interface). The FXS
port actually delivers the analog line to the subscriber. In other words it emulates the ‘plug on the wall’
that delivers a dial tone, battery current and ring voltage. FXS ports need to supply DC battery and AC
ringing to enable the connected telephone equipment to transmit speech energy and to power the
telephone equipment's ringing device.
These telephony parameters vary from country to country. When shipped from the factory, the MTA has
set these parameters to match the necessary specifications. You can manually configure them if you want
to override the default country values. (Notice: Incorrect input would result in poor voice quality or no
signal.)
Figure 29.
Regional Setting
Field Name
Description
Line Impedance
The best match impedance for the voice
port is the impedance setting that yields the
highest value of Echo Return Loss.
DC Current
The current on tip-ring, tip-to-ground and
ring-to-ground.
DC Ring Offset
The bias for ringing voltage. MTA uses this
parameter only for balancing ringing.
DC Ring Voltage
In USA, the minimum ring voltage supplied is
40Vrms. The voltage at the subscribers end
