Cortelco 2747 - Manual (Page 36)

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4.4 Phone Configuration on web
Clicking on the “Phone” icon will display the following page to allow
configuration of phone related parameters.
4.4.1 Prefix
These entries are used for VoIP systems which require special treatment of
country codes, international codes, and area codes.
Any numbers placed in the “My Country Code” and “Area Prefix Code”
boxes will be appended to the front of dialed numbers.
Any numbers placed in the “International Code” box will be removed
from the front of dialed numbers.
In most cases, these values are not needed and the boxes should be left
empty.
4.4.2 Voice
4.4.2.1 Ring Volume
Adjusts the volume of ringing.