Callcentric is a U.S.-based pay-as-you-go SIP provider that works with any standard SIP ATA. It's slightly less Canada-oriented than VoIP.ms, but simple to set up. See also SIP providers.

Complete Base configuration first.

Callcentric account¶

Username format¶

Every Callcentric account has a number starting with 1777. Each line is an extension of that account:

Using a separate extension for the ATA (rather than the main one) makes it easy to tell devices apart and revoke one without affecting others.

SIP password¶

Each extension has its own SIP password, set under the Extension menu in My Callcentric. Use a long, random value.

Server¶

Use the SIP server/domain shown in your My Callcentric account for device configuration. Callcentric has changed its recommended server settings over the years, so copy it from the portal rather than from an old guide.

Calling and numbers¶

Outbound calling requires a rate plan or prepaid credit. Incoming calls to a Callcentric number (DID) need the DID routed to the extension the ATA uses. Callcentric suggests a free test call to 17771234567 to confirm audio works.

911¶

Register a 911 address for the number in My Callcentric before relying on the line.

HT812 settings¶

Profile 1¶

FXS Port 1¶

Apply, confirm Registered on the Status page, then make the test call.

Sources¶

• Asterisk 14 Configuration and Review – Callcentric (username and extension format, SIP password, test number)
• Security considerations for Callcentric customers – Callcentric
• Callcentric SIP Trunk Configuration Guide – Yeastar
• HT812/HT814 Administration Guide – Grandstream