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