‍Effective Date: November 5, 2026

DI Voice involves two key components: Telecom Services (which are provided through DialStack, as the telecommunications carrier of record), and the DI Voice Subscription Service (which is provided by DI).  This Addendum is hereby expressly incorporated into and made a part of DI’s Customer Terms of Service, so any capitalized terms used but not defined here are defined in the Terms of Service.  

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This DI Voice Addendum describes the special terms and conditions uniquely applicable to DI Voice that either differ from, or are not addressed in, our Terms of Service.  

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Although your Agreement with DI governs all DI Subscription Services and its own products and services, including DI Voice Subscription Services, the DialStack Telecom Services are part of a Third Party Program, and the DialStack Telecom Services themselves are subject to the DialStack Service Subscription Agreement (the “DialStack Agreement”), which Customer must enter directly with DialStack in order to open a DialStack account, a necessary step before the DialStack Telecom Services can be provisioned.  In that DialStack Agreement, DI is referred to as DialStack’s “Platform Partner”, and its “billing agent” for the DialStack-provided Telecom Services.   If there is conflict between a specific provision in this DI Voice Addendum and a provision in the DialStack Agreement regarding the DialStack Telecom Services, the conflicting DialStack Agreement except with respect to fees, invoicing, and payment matters between Customer and DI (in which case this DI Voice Addendum and applicable DI Terms of Service apply).  

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ROLES AND RESPONSIBILITIES

‍DI is not the carrier of record for, and does not provide the Telecom Services.  DI will have administrative access to your DialStack account in order to provide the DI Voice Subscription Service and associated non-Telecom Services to you.  You are responsible what your employees, agents, and VOIP Users do using DI Voice, and for the accuracy and completeness of all information in your DialStack account and in the DI Voice Subscription Service.  

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IMPORTANT INFORMATION ABOUT EMERGENCY 911/E911 SERVICES

‍Please review Section 7 of the DialStack Agreement carefully, and ensure you and everyone who uses the Telecom Services is aware of and understands Section 7, as it contains critical information about how 911/E911 services work for the Telecom Services, and how it operates differently from a traditional landline.  The DI Voice Addendum summarizes some of the key points made in Section 7, but this is not a substitute for your obligation to review Section 7 of the DialStack Agreement.  

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The 911/E911 component of the Telecom Services relies on power, internet connectivity, and correct location data, so you should maintain at least one backup method of reaching 911 at each location (e.g., cell phone or landline), and it is critical that you advise all of your VOIP Users of the 911 limitations.  

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You are solely responsible for registering, reviewing, and periodically confirming the accuracy of the physical locations for all VOIP Users/phone numbers provisioned under your account (even if DI or someone else entered it on your behalf), and it is imperative that you keep all such information current, complete, and accurate at all times in your Telecom Services account, because it is that registered physical location information that used to route 911/E911 calls to the appropriate call center.  Inaccurate or incomplete physical location information can cause a 911 call to go to the wrong place or delay their arrival to the proper physical location.  It is your sole and exclusive responsibility to confirm the accuracy of your physical location information and for keeping it current, and DI is not responsible for errors, missing location information, your failure to follow the instructions and requirements in Section 7 of the DialStack Agreement, or for any 911/E911 services’ inability to locate or timely reach a physical location for any reason.  The 911 Release and Indemnity set forth in Section 7 of the DialStack Agreement expressly applies to DI as the “Platform Provider”.  

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TERM

DI Voice Subscription Service Term. The initial DI Voice Subscription Service Term begins on the Contract Start Date identified on the applicable Order (the “Effective Date”), and continues for twelve (12) months unless otherwise stated on the Order, and renews automatically for successive annual periods (or such other renewal periods specified in the Order), unless either party gives written notice of non-renewal in accordance with the Terms of Service.  Telecom Services are coterminous with the DI Voice Subscription Service Term.

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Telecom Services Term. Telecom Services are provided, and billed, on a calendar-month basis. The Telecom Services Term begins on the Effective Date of the Order Form and continues through the last day of the calendar month in which the DI Voice Subscription Service Term expires or is terminated for any reason.

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INVOICING AND FEES

For purposes of this DI Voice Addendum:

“DI Voice Subscription Fees” means the Subscription Service related Fee charged by DI for Customer’s subscription to DI Voice.

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“VOIP Fees” are the per phone number and per VOIP User per month fees (based on the number of VOIP Users provisioned as of the last day of the prior month) for the Telecom Services ordered, and are applicable whether or not used.  

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“VOIP Taxes” means all applicable federal, state and local taxes, surcharges and regulatory fees, including Universal Service Fund contributions, 911 and public safety fees, and regulatory cost recovery charges applicable to the DialStack Telecom Services.  VOIP Taxes are in addition to VOIP Fees, and are calculated by DialStack and assessed based on the service address Customer provides for each VOIP User and phone number (which Customer is responsible for keeping accurate with DI and DialStack at all times).  VOIP Taxes are subject to change at any time without notice, and are non-refundable and not subject to credit, proration or offset.

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"VOIP User", means each seat provisioned in the DI Voice platform for Telecom Services, whether or not used.

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Initial invoice. When the Order Form is processed, DI invoices all DI Subscription Services Fees prorated from the Effective Date through the last day of that first calendar month, together with hardware purchases and other one-time fees, and applicable taxes. VOIP Fees and VOIP Taxes for that partial month are invoiced in arrears on the next monthly invoice.

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Consolidated Invoicing. DI issues a single consolidated invoice on or about the first business day of each calendar month, covering all Subscription Services Fees and VOIP Fees for that calendar month in advance, prorated VOIP Fees for new phone numbers or VOIP Users added during the prior month, and all applicable taxes, including VOIP Taxes.

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Proration. Subscription Services Fees are prorated for the initial partial calendar month as described above and, where the Subscription Services Term ends other than on the last day of a calendar month, for that final partial month. VOIP Fees are prorated only for additional phone numbers or VOIP Users provisioned during a calendar month, and will be prorated from the date of provisioning through the last day of that calendar month, and invoiced in arrears. VOIP Fees are not prorated on removal of a VOIP User or phone number, and are not prorated in the final calendar month of the Telecom Services Term. No credit, refund or offset of  VOIP Fees or VOIP Taxes will be issued on such removals or for the final calendar month.

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Quantities, Rates, and Overage Fees. The quantities and rates configured in the DI Voice Subscription Service are the basis for invoicing, and include up to 2,000 minutes per VOIP User per month. Usage of over 2,000 minutes per VOIP User per month is subject to a $0.02 per minute charge for such excess minutes.  Customer is responsible for all VOIP Users and phone numbers provisioned under its account, whether by Customer, its administrators, DI at Customer’s request, or by DialStack. DI’s records are conclusive absent manifest error. Customer must notify DI of any billing dispute within fifteen (15) days of the invoice date; undisputed amounts remain payable when due.

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Rates. Rates stated on the Order Form apply as of the Effective Date. DI may decrease rates at any time. DI will not increase a per-VOIP User or per-phone number rate during the then-current Subscription Term except (a) by new or amended Order Form, (b) on thirty (30) days’ written notice effective at renewal, or (c) as a pass-through of increased third-party carrier, regulatory or governmental charges.

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EFFECTS OF TERMINATION

Access to the DI Voice Subscription Service and all associated Telecom Services ceases at the end of the Subscription Services Term.  If DI terminates for Customer’s material breach (including non-payment), all remaining DI Voice Subscription Service Fees for the balance of the then-current DI Voice Subscription Service Term become immediately due, and VOIP Fees and VOIP Taxes remain payable through the end of the calendar month in which termination occurs.  Telephony hardware is non-returnable and non-refundable (except as otherwise expressly agreed by DI in writing), and DI has no obligation to issue any credit for telephony hardware upon or after expiration or termination of DI Voice Subscription Service and/or Telecom Services.  Payment obligations, VOIP Taxes and VOIP Fees, disclaimers and limitation of liability survive any such termination or expiration.