Independent of geographical location 850 numbers preferably instead of 444 numbers by corporate companies and call centers. Advantages of 850 numbers;
a) There is no cost for coming calls the owner of the 0850 number.
b) Fee belongs only to caller.
c) Any additional cost is involved becouse of charging falls from the callers fixed or GSM package minutes.
d) There is highly pricing for 444 numbers establishing and fixed monthly fee. Must be made to identify at least 5 fixed number, depending on the 444 number.
f) 850 numbers receive service over IP. There is not any physical limits becouse of IP based. Namely , can be called at simultaneously high capacity on 850 only one number. 444 numbers analog (PSTN) are defined on the fixed-line numbers. Must be made to identify at least 5 fixed number, depending on the 444 number. Under that definition determines the number of fixed lines, the number of simultaneous calls that can be created through a 444 number (for example; defined 5 number, simultaneous calls can be 5 and the number will be busy for 6th call.)