At its election, CallTower may schedule maintenance during a standard maintenance window on the third Friday of every month from 10:00 PM to 4:00 AM Mountain Time and will provide Customer with a 1-week notice of all scheduled maintenance; notice of Scheduled Maintenance shall be provided to Customer’s designated point of contact CallTower email. CallTower may schedule a weekly certificate upload every Friday at 12:00 AM Mountain Time on the Skype for Business platform. This process has no customer impact, and services remain functional during the upload. Such service unavailability shall not be considered a factor in determining Service Level Availability.
If Customer opens a trouble ticket with CallTower Customer Support within 3 days of Customer’s failure to access CallTower’s Service, and CallTower determines in its reasonable commercial judgment that the Service is unavailable due to an outage caused solely by the items of the Service managed by CallTower, that Service interruption will be used to calculate Service unavailability to determine the remedies provided below.
Service shall be deemed by CallTower to be unavailable if CallTower’s servers are not responding to hypertext transfer protocol (HTTP) requests, or CallTower Services are not responding to telephone calls received through the public switched telephone network (PSTN); CallTower’s records and data shall be the basis for all Service availability calculations and determinations. Unavailability of CallTower’s Service due to (a) acts or omissions by the Customer, its agents or any user of the Service authorized by Customer; (b) Customer power outage; (c) network unavailability or interruption external to the CallTower data center or outages resulting from services from third-party partner network providers, even if contracted by CallTower for the benefit of Customer; (d) scheduled maintenance; (e) interruptions relating to account codes, client network connections and environment, client Outlook, and DNS services; (f) external network connection interruption by a third party even when contracted by CallTower on behalf of Customer; (g) connections brought down by any company or individual (including Customer) outside of CallTower; (h) Customer’s applications, equipment, or facilities; or (i) events of Force Majeure shall not be deemed Service unavailability for the purpose of these Service Level Agreements. Where CallTower delivers its Services over the Internet (outside a private network) to offices or individual users CallTower cannot guarantee availability and are thus expressly excluded from these Service Level Agreements
CallTower’s Service guarantee ensures that Customers receive the following levels of Service:
99.999% uptime in any calendar month. For purposes of CallTower’s Service Level Agreement (SLA), interruptions in service during planned maintenance do not apply to uptime commitment. Interruption in uptime is defined as a majority of customer’s users unable to make and / or receive calls through CallTower’s network or with audio degraded to the point of unintelligibility. Issues with cloud providers outside of CallTower’s network such as Microsoft Teams, Cisco Webex, and Zoom are not included in CallTower uptime calculations. PSTN, internet, or circuit issues outside of CallTower’s network or between CallTower and customer premise are not included in uptime calculations. Voice service for unified communications and contact center are covered under this service level commitment.
99.95% uptime in any calendar month. For purposes of CallTower’s Service Level Agreement (SLA), interruptions in service during planned maintenance do not apply to uptime commitment. Issues with cloud providers outside of CallTower’s network are not included in CallTower uptime calculations.
At Customer’s request, the prorated credit will be in the amount of one day of the Customer’s cost of the affected CallTower Service for each cumulative hour of Service unavailability that falls below the SLA stated above
Updated February 2025