Whose number in thee WH was Tobin calling?

TPM Muckraker April 11, 2006 11:50 AM (Printable Format):

"As the AP reported yesterday, James Tobin, the RNC regional political director who helped orchestrate the New Hampshire phone jamming, was in very frequent contact with the White House.

But who at the White House? Tobin was calling one number, a number in the White House's Office of Political Affairs - which was run by Ken Mehlman at the time. Whose number was it?
The AP asked the White House who Tobin was calling, but they were stonewalled ."