What does DDO stand for?
DDO stands for "Direct Dialing Outgoing"
How to abbreviate "Direct Dialing Outgoing"?
"Direct Dialing Outgoing" can be abbreviated as DDO
What is the meaning of DDO abbreviation?
The meaning of DDO abbreviation is "Direct Dialing Outgoing"
What does DDO mean?
DDO as abbreviation means "Direct Dialing Outgoing"
