Cal4Care offers reliable, fast and cost-effective SIP Trunk solutions for many regions. Our SIP Trunks are certified by communications solutions providers: 3CX, Asterisk, Grandstream, Cisco, Avaya and FreePBX.  

Our SIP Trunks have passed the 3CX interoperability testing. They are on the preferred SIP Trunk providers list and can be plug’n’played with 3CX. 

Use Cal4Care’s SIP Trunks to take full advantage of your IP telephony solution by completely utilizing IP Phones, DID numbers, apps, email to fax, fax to email, and Cloud PBX.