PROMISSORY NOTE

Exhibit 10.11

PROMISSORY NOTE

          FOR VALUE RECEIVED, the undersigned, XETA TECHNOLOGIES, INC., an Oklahoma corporation (“Maker”), promises to pay to the order of BANK OF OKLAHOMA, N.A. (“Lender”), at its offices in Tulsa, Oklahoma, the principal sum of Seven Million Five Hundred Thousand and No/100 Dollars ($7,500,000) or, if less, the aggregate sum of advances made by Lender to Maker under the Revolving Credit and Term Loan Agreement dated October 1, 2003 (“Credit Agreement”) between Maker and Lender, payable as follows (all capitalized terms used but not defined herein shall have the meanings given in the Credit Agreement):

          “Note Rate” shall mean a rate at all times equal to the Adjusted Prime Rate or the Adjusted LIBOR Rate, as elected by Maker pursuant to a properly made Interest Rate Election (defined below), provided, that at the end of any applicable Interest Period (defined below), the Note Rate shall revert to the Adjusted Prime Rate unless a new Interest Rate Election has been properly made by Maker. The Adjusted Prime Rate and the Adjusted LIBOR Rate shall be calculated, on any date of determination thereof, as follows:

The Adjusted LIBOR Rate and Adjusted Prime Rate shall be recalculated on not less than a quarterly basis, on the date on which the Lender is in receipt of Maker’s most recent financial statements (and, in the case of the year-end financial statements, audit report) for the fiscal quarter then ended (“Pricing Date”). From the date of this Agreement to the first recalculation, the Adjusted LIBOR Rate shall be set at the LIBOR Rate plus 1.75 percent (1.75%), and the Adjusted Prime Rate shall be set at the Prime Rate minus .875 percent (-.875%). The Note Rate shall be established based on the ratio of Funded Debt to Cash Flow for the most recently completed fiscal quarter and

the Note Rate established on a Pricing Date shall remain in effect until the next Pricing Date. If the Maker has not delivered its financial statements by the date such financial statements (and, in the case of the year-end financial statements, audit report) are required to be delivered under the Credit Agreement, until such financial statements and audit report are delivered, the Note Rate shall be the Prime Rate minus one and one hundred twenty-five thousandths of one percent (1.125%). If the Maker subsequently delivers such financial statements before the next Pricing Date, the Note Rate established by such late delivered financial statements shall take effect from the date of delivery until the next Pricing Date. In all other circumstances, the Note Rate established by such financial statements shall be in effect from the Pricing Date that occurs immediately after the end of the fiscal quarter covered by such financial statements until the next Pricing Date. Each determination of the Note Rate made by the lender in accordance with the foregoing shall be conclusive and binding on the Maker and the Lender if reasonably determined. Any change in the Note Rate resulting from a change in the Prime Rate shall be effective as of the opening of business on the day on which such change in the Prime Rate becomes effective.

          “Funded Debt’ (for purposes of this Note) shall mean all interest bearing debt.

          “Cash Flow” (for purposes of this Note) shall mean EBITDA less Cash Taxes.

          “Interest Rate Election” means written notice from Maker to Lender no earlier than twenty (20) days and no later than five (5) days prior to the contemplated effective date, substantially in form and content as set forth on Exhibit “A” hereto, whereby Maker may elect from time to time that interest shall accrue hereunder at the Adjusted Prime Rate or the Adjusted LIBOR Rate.

          “LIBOR Rate” means the London Interbank Offered Rate composite rate per annum for U.S. Dollars for the applicable Interest Period which appears on the LIBOR 01 page of the Reuters information service on the day the Interest Rate Election is received by Lender. The LIBOR Rate shall remain fixed during the applicable Interest Period.

          “Interest Period” shall mean a period of time equal to the lesser of (i) at the election of the Maker, thirty (30), sixty (60), or ninety (90) days; or (ii) the number of day