Thomas H. Lee Equity Fund VI, L.P. Thomas H. Lee Parallel Fund VI, L.P. Thomas H. Lee Parallel (DT) Fund VI, L.P. THL Equity Fund VI Investors (West), L.P. THL Coinvestment Partners, L.P. Putnam Investments Holdings, LLC Putnam Investments Employees Securities Company III LLC THL Fund VI Bridge Corp. THL Parallel Fund VI Bridge Corp. THL DT Fund VI Bridge Corp. c/o Thomas H. Lee Partners, L.P. 100 Federal Street Boston, MA 02110

Exhibit 10.01

March 21, 2013

To Whom It May Concern,

Reference is made to that certain Amended and Restated Stockholder Agreement, dated as of March 8, 2013 (the “Agreement”), by and among West Corporation, Thomas H. Lee Equity Fund VI, L.P., Thomas H. Lee Parallel Fund VI, L.P., Thomas H. Lee Parallel (DT) Fund VI, L.P., THL Equity Fund VI Investors (West), L.P., THL Coinvestment Partners, L.P., Putnam Investments Holdings, LLC, Putnam Investments Employees’ Securities Company III LLC, THL Fund VI Bridge Corp., THL Parallel Fund VI Bridge Corp., THL DT Fund VI Bridge Corp. and each other Person executing this Agreement and listed as a THL Investor on the signature pages hereto (collectively, with their permitted transferees, the “THL Investors”), Quadrangle Capital Partners II LP, Quadrangle Capital Partners II-A LP and Quadrangle Select Partners II LP and each other Person executing this Agreement and listed as a Quadrangle Investor on the signature pages hereto (collectively, with their permitted transferees, the “Quadrangle Investors”), any other Persons who from time to time become party hereto by executing a counterpart signature page hereof and are designated by the Board as “Other Investors”, including SONJ Private Opportunities Fund, L.P. (the “Company”), Gary West CRT1 LLC, Gary West CRT2 LLC, Gary West CRT3 LLC, Gary West CRT4 LLC and Gary West CRT5 LLC as permitted transferees of Gary L. West, Mary West CRT1 LLC, Mary West CRT2 LLC, Mary West CRT3 LLC, Mary West CRT4 LLC and Mary West CRT5 LLC as permitted transferees of Mary E. West (collectively, the “Founders”), and the other parties thereto (if any).

Further to our previous discussions, the Company hereby confirms its desire to no longer be a party to the Agreement and acknowledges and agrees that following its execution of this letter, as of the date first written above, it will no longer be a party to the Agreement or have any rights or obligations under the Agreement with respect to the 57,948 shares of common stock of West Corporation, par value $0.001 per share, beneficially owned by the Company on March 21, 2013. By executing this letter, the undersigned acknowledges and agrees that as of the date first written above, the Company is no longer a party to the Agreement and no longer has any rights or obligations under the Agreement.

2

IN WITNESS WHEREOF, each of the undersigned has duly executed this Agreement (or caused this Agreement to be executed on its behalf by its officer or representative thereunto duly authorized) under seal as of the date first above written.

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March 21, 2013

To Whom It May Concern,

Reference is made to that certain Amended and Restated Registration Rights and Coordination Agreement, dated as of March 8, 2013 (the “Agreement”), by and among West Corporation, Thomas H. Lee Equity Fund VI, L.P., Thomas H. Lee Parallel Fund VI, L.P., Thomas H. Lee Parallel (DT) Fund VI, L.P., THL Equity Fund VI Investors (West), L.P., THL Coinvestment Partners, L.P., Putnam Investments Holdings, LLC, Putnam Investments Employees’ Securities Company III LLC, THL Fund VI Bridge Corp., THL Parallel Fund VI Bridge Corp., THL DT Fund VI Bridge Corp. and each other Person executing this Agreement and listed as a THL Investor on the signature pages hereto (collectively, with their permitted transferees, the “THL Investors”), Quadrangle Capital Partners II LP, Quadrangle Capital Partners II-A LP and Quadrangle Select Partners II LP and each other Person executing this Agreement and listed as a Quadrangle Investor on the signature pages hereto (collectively, with their permitted transferees, the “Quadrangle Investors”), any other Persons who from time to time become party hereto by executing a counterpart signature page hereof and are designated by the Board as “Other Investors”, including SONJ Private Opportunities Fund, L.P. (the “Company”), Gary West CRT1 LLC, Gary West CRT2 LLC, Gary West CRT3 LLC, Gary West CRT4 LLC and Gary West CRT5 LLC as permitted transferees of Gary L. West, Mary West CRT1 LLC, Mary West CRT2 LLC, Mary West CRT3 LLC, Mary West CRT4 LLC and Mary West CRT5 LLC as permitted transferees of Mary E. West (collectively, the “Founders”), and the other parties thereto (if any).

Further to our previous discussions, the Company hereby confirms its desire to no longer be a party to the Agreement and acknowledges and agrees that following its execution of this letter, as of the date first written above, it will no longer be a party to the Agreement or have any rights or obligations under the Agreement with respect to the 57,948 shares of common stock of West Corporation, par value $0.001 per share, beneficially owned by the Company on March 21, 2013. By executing this letter, the undersigned acknowledges and agrees that as of the date first written above, the Company is no longer a party to the Agreement and no longer has any rights or obligations under the Agreement.

IN WITNESS WHEREOF, each of the undersigned has duly executed this Agreement (or caused this Agreement to be executed on its behalf by its officer or representative thereunto duly authorized) under seal as of the date first above written.

[Signature Page to Amended and Restated Registration Rights and Coordination Agreement Letter Agreement]

[Signature Page to Amended and Restated Registration Rights and Coordination Agreement Letter Agreement]

[Signature Page to Amended and Restated Registration Rights and Coordination Agreement Letter Agreement]