SIGNALLING STRING
This object gathers signaling non-digital option attributes.

String System Option
Option max.len. (fixed)
This attribute defines the max. length of the parameter of the option selected.
For example, the max. length of the country code is 8 (this attribute cannot be managed).

Country Code
Prefix of the country that is local to the node (e.g. 1 for the US, 33 for France, 352 for Luxembourg).
This attribute is used within the frame of an international network for incoming calls on a country node registered on a set of another country.
This feature is useful to call back external calls not answered.