Exhibit 99.1 June 11, 1999 BellSouth Wireless, Inc. 1155 Peachtree Street Suite 1900 Atlanta, GA 30309 Attention: Mr. Joel L. A. Peterson Mr. John J. Jenkins Gentlemen: This non-binding memorandum of understanding expresses the intent of NumereX Corporation ("NMRX") and BellSouth Wireless, Inc. ("BLS") to restructure certain economic and other provisions of the Operating Agreement (the "Operating Agreement") of Cellemetry LLC ("Cellemetry"), a Delaware limited liability company, in order to better position Cellemetry for a mutually beneficial future. Set forth below are the principal understandings and business terms between NMRX and BLS which will be embodied in a definitive amendment to the Operating Agreement and other appropriate documents: 1. NMRX and BLS will adopt a mutually acceptable revised 5 year business plan for Cellemetry beginning as of May 15, 1999 through May 15, 2004. All respective rights between the parties under Sections 12.13 and 12.17 of the Operating Agreement that presently trigger 3 years from May 15, 1998 will be revised to trigger May 15, 2002 and all financial performance tests will be amended to reflect the revised business plan. Section 12.17(a) of the Cellemetry Operating Agreement will be revised to reflect that the price at which BLS may put its ownership interest to NMRX will be $17 million with no interest compounding thereon. 2. BLS will be issued $3 million of 8% Series A Convertible, Redeemable Preferred Stock of NMRX (the "Preferred Stock"). The Preferred Stock will be convertible into 625,000 shares of NMRX common stock beginning the earlier of (i) May 15, 2002, if, at any time prior to the conversion date, the average reported closing sales price for the NMRX common stock over 20 trading days in any 60 day period equals or exceeds $7.00 or (ii) May 15, 2003. 3. Cellemetry will seek to find either a foreign carrier or strategic investor ("Third Party Investment") to invest new capital in exchange for up to 15% of Cellemetry. In connection with any such Third Party Investment, NMRX's ownership interest in Cellemetry will not be diluted below 51% and BLS will not be diluted below 34%. The provisions contained in Section 7.2.1 of the Operating Agreement, to the extent applicable to the Third Party Investment, except as to price, and other provisions to be discussed, will be revised to reflect that BLS's consent to the actions described therein will not be unreasonably withheld. 1 4. From and including May 15, 1999, NMRX will be under no obligation to make any additional capital contributions to Cellemetry. To the extent NMRX does make additional capital contributions to Cellemetry prior to the Third Party Investment, BLS's interest in profits and losses will not be reduced by such contributions, but instead such contributions will be credited solely to NMRX's capital account. 5. BLS and NMRX will both use their respective commercially reasonable best efforts to negotiate an amendment to the Operating Agreement and to negotiate documents relating to the Preferred Stock consistent with Exhibit A attached hereto that include the above understandings and terms; such agreement and such other documents as deemed necessary by BLS and NMRX to be executed as soon as practicable. 6. This letter is governed by and shall be construed in accordance with the laws of the State of Delaware, excluding any conflict-of-laws rule or principle that might refer the governance or the construction of this letter to the laws of another jurisdiction. Although this letter expresses the intentions of the parties as herein provided, nothing herein set forth shall be construed as or be deemed to constitute a legally enforceable or binding right or obligation of any of them, and no party will be bound, legally or otherwise, until definitive agreements regarding the matters set forth above are executed by the parties and other persons who shall be appropriate signatories; provided, however, the covenants set forth above in paragraphs 5 and 6 shall be binding in consideration of the efforts of the parties to proceed toward preparation of definitive agreements respecting the transactions outlined above. If the foregoing accurately summarizes our mutual understanding, please sign this letter in the space provided below. Very truly yours, NUMEREX CORPORATION By: /s/ A. Ryan ------------------- ACCEPTED AND AGREED: BELLSOUTH WIRELESS, INC. By: /s/ John J. Jenkins ------------------- 2 Exhibit A NUMEREX CORP. CONVERTIBLE PREFERRED STOCK TERM SHEET The following is a term sheet relating to the placement of up to 30,000 shares at $100 per share Stated Value of Series A Convertible Preferred Stock of NumereX Corp. The obligations of the Issuer and the Investor to close the investment described in the Term Sheet are subject in their entirety to agreement to the terms of the definitive documentation to be executed and delivered in connection with the placement. Issuer: NumereX Corp., a Pennsylvania corporation (the "Company") Purchaser: BellSouth Wireless, Inc. (the "Investor") Type of Security: Series A Preferred Stock ("Series A Preferred") Stated Value: $100 per share of Series A Preferred Amount: 30,000 shares of Series A Preferred Dividends: A cumulative compound dividend on the Series A Preferred would accrue as of the closing date at a rate of 8% per annum, payable on a quarterly basis. Accrued dividends would be payable (a) if, as and when determined by the Company's Board of Directors, (b) upon the liquidation or winding up of the Company, or (c) upon redemption of the Series A Preferred. No dividends may be declared and/or paid on the Common Stock until all dividends have been paid in full on the Series A Preferred. Dividends will cease to accrue in the event that the Investor converts its holdings to Common Stock. In the event the Company fails to pay dividends for two consecutive quarters, the Investor would be entitled to designate one Director to serve on the Company's Board of Directors. 1 Liquidation Preference: In the event any liquidation, dissolution or winding up of the Company, whether voluntary or involuntary, the Investor would be entitled to receive, prior and in preference to any distribution of the assets or surplus funds of the Company to the holders of the Common Stock, the amount of $100 per share of Series A Preferred (as adjusted for any combinations, consolidations, stock distributions or stock dividends with respect to such shares) plus all unpaid dividends on such shares for each share of Series A Preferred then held by the Investor. After the payment of such liquidation preference, the Investor would share on a prorata basis with the holders of all other Capital Stock of the Company in any available distributions. A consolidation or merger of the Company or sale of all or substantially all of its assets (as defined in the definitive agreements) would be deemed, at the Investor's option, to be a liquidation or winding up for purposes of the liquidation preference. Conversion: Optional Conversion: The Series A Preferred would be convertible at any time after May 14, 2003 at the option of the holder thereof into 625,000 shares of Common Stock subject to adjustment for certain events. Early Conversion: (A) the Series A Preferred would be convertible at any time at the option of the Investor into 625,000 shares of Common Stock upon announcement of a transaction or event resulting in a Change in Control; (B) For a one year period beginning May 15, 2002 and ending May 14, 2003, the Series A Preferred would be convertible at the option of the Investor into 625,000 shares of Common Stock, if at any time from the closing date to the conversion date, the closing price of the Company's Common Stock equals or exceeds an average of $7.00 per share for 20 trading days in any 60 day period. Change of Control: A "Change in Control" shall be deemed to occur if: 2 1. Any person, excluding employee benefit plans of the Company, is or becomes the "beneficial owner" (as defined in Rules 13d-3 and 13d-5 under the Securities Exchange Act), directly or indirectly, or securities of the Company representing twenty-five percent (25%) or more of the combined voting power of the Company's then outstanding securities, provided, however, that such an acquisition of beneficial ownership representing between twenty-five percent (25%) and fifty percent (50%), inclusive, of such voting power shall not be considered a Change in Control if the Board approves such acquisition either prior to or immediately after its occurrence; 2. The Company consummates a merger, consolidation, share exchange, or other reorganization or transaction of the Company (a "Fundamental Transaction") with any other corporation, other than a Fundamental Transaction that results in the voting securities of the Company outstanding immediately prior thereto continuing to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity) at least fifty-one percent (51%) of the combined voting power immediately after such Fundamental Transaction of (x) the Company's outstanding securities or (y) the surviving entity's outstanding securities; 3. The stockholders of the Company approve a plan of complete liquidation or winding-up of the Company or an agreement for the sale or disposition (in one transaction or a series of transactions) of all or substantially all of the Company's assets; or 4. Any event or series of events results in the Directors on the Board of Directors who were Directors prior to the event or series of events (or Directors nominated by such Directors) cease to constitute a majority of the Board of Directors or of any parent of or successor to the Company. Notwithstanding anything to the contrary herein, a divestiture or spin-off of a subsidiary of the Company other than Cellemetry LLC shall not by itself constitute a "Change in Control." 3 Antidilution Provisions: In the event of stock splits, stock dividends, reorganizations, mergers, consolidations or sale of assets, there would be a proportional adjustment in the conversion price and in the number of shares of Common Stock to be received upon conversion. In the event that the Company issues or sells any Common Stock (at any time after the original issue date for the Series A Preferred) or warrants, options, convertible securities or other rights to purchase Common Stock ("Common Stock equivalents") at a price per share less than the then fair market value of the Common Stock, the Series A Preferred shares would be provided anti-dilution protection in accordance with a formula to be set forth in the Series A Preferred financing documentation, provided, however, that such anti-dilution protection would not apply to future issuances of shares of Common Stock pursuant to employee benefit plans adopted by the Board of Directors. Board Observer Rights: The Investor would be entitled to designate a person reasonably acceptable to the Company to attend Board meetings as an invitee, who shall have all of the privileges and benefits of a Director of the Company except voting rights. Restrictions and Limitations: Consent of the Series A Preferred, voting as a separate voting group, would be required for any actions which: (i) alter or change the rights, preferences or privileges of the Series A Preferred; (ii) increase the authorized number of shares of Series A Preferred; (iii) create any new class or series of stock which has preference over or is on parity with the Series A Preferred; or (iv) involve a repurchase or other acquisition of shares of the Company's stock other than repurchases of common stock with a value not in excess of $1.5 million on an annual basis as long as the Company is current in its dividends on the Series A Preferred, and other than pursuant to redemption provisions described below under "Redemption." 4 Redemption: At the option of the Company, the Company may redeem all, but not less than all, of the Series A Preferred on the dates and the amounts that follow, plus accrued but unpaid dividends: Amount Payable Date Upon Redemption ---- --------------- May 15, 2000 $4,225,000 May 15, 2001 $6,350,000 May 15, 2002 $8,980,000 Conditions precedent to Investor's (i) Execution of amendment to the obligation to invest: Cellemetry LLC Operating Agreement. (ii) Legal documentation reasonably satisfactory to Investor and Investor's counsel. (iii) Satisfactory completion of due diligence. Registration Rights: The Investor would have the following registration rights with respect to shares of Company Common Stock to be issued on conversion at the Company's expense: (i) Three (3) piggyback rights, except that the underwriter would have the right to limit what is sold, so market price is not adversely affected. (ii) One (1) S-3 demand registration (or short-form registration), if the Company qualifies for the use of such short-form registration statements. (iii) The Company would not grant future piggyback rights more favorable than those granted to the Investor without granting the Investor such more favorable rights. (iv) The Company would comply with all necessary requirements to enable the Investor and any transferees to sell shares under Rule 144. 5 Purchase Agreement: The purchase of the Company's Series A Preferred would be made pursuant to a Series A Convertible Preferred Purchase Agreement drafted by counsel to the Company which would be mutually agreeable to the Company and the Investor. This agreement would contain, among other things, usual and customary representations and warranties of the Company and the Investor, covenants of the Company and the Investor reflecting the provisions set forth herein and other usual and customary covenants, and appropriate conditions of closing, including among other things, qualification of the shares under applicable Blue Sky laws and the filing of a certificate of designation to authorize the Series A Preferred, (such certificate to be drafted by counsel to the Investor) and an opinion of counsel. Until the Purchase Agreement is signed, there would not exist any binding obligation on the part of either party to consummate the transaction. This Term Sheet does not constitute a contractual commitment of the Company or the Investor or an obligation of either party to negotiate with the other. Intent of Parties: The parties agree to proceed in good faith to execute and deliver definitive agreements incorporating the terms outlined above and such additional terms as are customary for transactions of the type described herein. This Term Sheet expresses the intent of the parties and is not legally binding on any of them unless and until such mutually satisfactory definitive agreements are executed and delivered by the undersigned. 6