(thing) by tripitaka Thu Aug 09 2001 at 14:40:40
In telecomms, the A number is the calling party, or current call originator.

If Mike on 212-1234 calls Dave on 212-5678, 212-1234 is the A number and 212-5678 is the B number

This value can change during a call if number translation is being used.

I like it!

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