Cloud collaboration, UC and Contact Center tools have quickly enabled the new remote and distributed worker environment. However, these powerful “internal” communications tools often have limited access to the “outside” PSTN and call routing integration that enable a complete, cost effective enterprise telephony solution.

Cloud Voice Hub, the evolution of CallTower’s award-winning global SIP trunking service, is purpose-built to solve these challenges. Available in over 70+ countries, Cloud Voice Hub provides certified, secure cloud SIP PSTN connectivity to all major cloud collaboration, unified communications and contact center services including Cisco (Webex Calling and UCM Cloud), Microsoft Teams (Direct Routing), Genesys, Avaya, Zoom and NICE InContact.




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Global PSTN Coverage for Collaboration, UC and Contact Centers Platforms

Consolidate local PSTN in the Americas, EMEA and APAC with local DID numbers and number portability in over 70 countries worldwide and fully integrated and certified with major collaboration providers including Cisco, Microsoft, Genesys, Avaya, Zoom and NICE InContact.


Complete PSTN Service Features

Cloud Voice Hub provides complete local PSTN capabilities including local, long distance, on-net calling, toll-free, directory assistance, caller ID and emergency services.


Multiple Platform Integration and Migration Flexibility

Whether you have a single platform requiring certified cloud PSTN or multiple platforms requiring certified cloud PSTN and on-net calling capability, CallTower’s Cloud Voice Hub has you covered. CallTower integrates disparate platforms with certified, cloud-based SBC on-net call routing which greatly simplifies management, reduces cost and enables more flexible migration strategies.


Certified Solutions Ensuring Performance

CallTower has certified its global PSTN infrastructure and networks with major collaboration providers including Cisco (Webex Calling and UCM Cloud), Microsoft Teams Direct Routing, Genesys, Avaya, Zoom and NICE InContact. Cloud Voice Hub combines these world-class collaboration tools with our world-class SIP PSTN services to provide a complete communications solution to meet the most challenging customer requirements.