Callendax

Callendax is a wholesale voice carrier offering A-Z termination, DID numbers and SIP trunking on a carrier-grade network. It serves service providers and contact centres, buying capacity directly from terminating operators and reselling it with published rate decks, route monitoring and 24/7 network operations support. Its offering spans least-cost routing with quality floors, DID coverage across more than 60 countries, and flexible prepaid or postpaid billing. The company emphasizes route reliability, transparent CDR reporting, and responsive engineering support, positioning itself as a dependable partner for providers running production voice traffic that needs consistent quality and quick issue resolution.