Partner Ecosystem
CallTower
Part of the Rubber Duck Technology partner ecosystem — vetted for capability, accountability, and fit before they ever meet a client.
About the partner
About CallTower
Cloud Communications Solutions for Microsoft Teams + Cisco Webex
CallTower is a US-based unified communications and contact center provider with one of the strongest Microsoft Teams Operator Connect / Direct Routing practices in the channel. CallTower delivers integrated UCaaS (Microsoft Teams Voice, Cisco Webex Calling, native CallTower CXM), CCaaS, SIP trunking, and a Voice Operator Suite to mid-market and enterprise customers. Backed by HGGC private equity. Strong channel-led GTM through TSDs.
Why teams choose CallTower
- One of the largest Microsoft Teams Operator Connect providers
- Multi-platform UCaaS (Teams, Webex Calling, native CallTower)
- Channel-led GTM (TSD-friendly)
- HGGC private equity backing
- Mid-market to enterprise focus
Capabilities we have validated
- Microsoft Teams Operator Connect (one of the largest providers)
- Multi-UCaaS platform (Teams + Webex Calling + Native)
- DRaaS (Direct Routing as a Service)
- Strong channel-led GTM
- Mid-market enterprise focus
Recognition & proof points
- Microsoft Verified Operator Connect Provider
- Cisco Webex Calling certified
- Frost & Sullivan recognition
AI in the offering
AI-powered features are delivered through the CallTower Solgari CCaaS suite (conversational AI, sentiment and voice analytics, call transcription/summaries) and Microsoft Teams/Copilot-enabled UC; CallTower is a UC/CC delivery provider that embeds and resells these AI capabilities rather than developing a native AI engine.
Profile maintained by Rubber Duck Technology research from primary sources and partner collateral · Last verified Sep 7, 2026 · High confidence · Verified multi-source.
Capabilities
Solutions Delivered by CallTower
The outcomes this partner is equipped to deliver — drawn from our vetting record, not their marketing deck.
communications_cx
UCaaS / Cloud PBX
CallTower delivers multi-platform UCaaS spanning Microsoft Teams Voice, Cisco Webex Calling, and its native CallTower platform for mid-market and enterprise customers.
Multi-platform UCaaS — Offers Teams, Webex Calling, and native CallTower from one provider rather than a single platform.
Mid-market to enterprise — Focused on serving mid-market and enterprise communications needs.
Integrates with Microsoft TeamsCisco Webex
communications_cx
Microsoft Teams Voice
CallTower runs one of the largest Microsoft Teams Operator Connect and Direct Routing practices in the channel, adding enterprise voice to Microsoft Teams.
Top Operator Connect — Among the largest Microsoft Teams Operator Connect providers in the market.
Direct Routing as a Service — Offers DRaaS to bring PSTN calling into Teams flexibly.
Integrates with Microsoft Teams
communications_cx
SIP Trunking
CallTower provides SIP trunking and hosted voice to connect customer telephony to the PSTN alongside its UCaaS platforms.
Voice integration — SIP trunking complements Teams and Webex voice deployments from one provider.
Channel-friendly — Sold through a TSD-friendly channel-led go-to-market.
Integrates with Microsoft TeamsCisco Webex
communications_cx
CCaaS / Cloud Contact Center
CallTower delivers CCaaS through its CallTower Solgari offering, extending contact center capabilities alongside its UCaaS platforms.
Integrated UC + CC — Contact center pairs with the UCaaS portfolio from a single provider.
CRM connectivity — Integrates with Salesforce and major CRMs for contact center workflows.
Integrates with Microsoft TeamsSalesforce
communications_cx
Video Conferencing / Collaboration
CallTower delivers collaboration and video through Microsoft Teams and Cisco Webex as part of its multi-platform UCaaS portfolio.
Platform choice — Customers can collaborate on Teams or Webex under one provider.
Unified experience — Video and voice are delivered together within the UCaaS platform.
Integrates with Microsoft TeamsCisco Webex
Delivery
How We Deliver
Engagement & delivery models we have validated with this partner — where the slide deck ends and the actual work begins.
communications_cx
Implementation & Onboarding
CallTower provides implementation and enablement to stand up Teams Voice, Webex Calling, native CallTower, and contact center solutions for customers.
Delivery: Delivered as project-based implementation and enablement, often via TSD channel partners.
Multi-platform expertise — Teams handle implementations across Teams, Webex, and native CallTower.
Operator Connect depth — Strong Teams Operator Connect practice supports complex voice rollouts.
Integrates with Microsoft TeamsCisco Webex
communications_cx
Migration Services
CallTower migrates customer voice and collaboration workloads onto Microsoft Teams, Webex Calling, or its native platform.
Delivery: Delivered as project-based migration engagements.
Platform flexibility — Customers can migrate to Teams, Webex, or native CallTower as best fits.
Voice continuity — Deep DRaaS and Operator Connect expertise preserves enterprise voice during moves.
Integrates with Microsoft Teams
communications_cx
24/7 Support
CallTower provides around-the-clock support for its UCaaS, CCaaS, and voice services across mid-market and enterprise customers.
Delivery: Delivered as fully managed 24/7 support.
Always-on coverage — 24/7 support keeps communications services available for enterprise customers.
Multi-platform support — Covers Teams, Webex, and native CallTower from one support organization.
communications_cx
Customer Success
CallTower supports ongoing adoption and optimization of its communications platforms for mid-market and enterprise customers.
Delivery: Delivered as an ongoing managed customer success engagement.
Enterprise focus — Success teams are oriented to mid-market and enterprise needs.
Platform optimization — Helps customers get value across multiple UCaaS platforms.
communications_cx
Partner Enablement
CallTower equips TSDs and channel partners to sell and deliver its multi-platform UCaaS and CCaaS portfolio.
Delivery: Delivered through a channel-led go-to-market focused on TSD partners.
TSD-friendly GTM — Channel-led model is built around technology services distributors and partners.
PE-backed stability — HGGC private equity backing supports a durable partner program.
Proof
Results with this partner
Documented outcomes from real engagements — not testimonial vibes.
CallTower · Professional Services
KPFF moves 14 departments to Microsoft Teams calling with CallTower
Read more
Resources
Documents & collateral
Datasheets, spec sheets, case studies and pricing references collected while vetting CallTower — 5 documents.
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