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🌍 Using Telnyx + Zoiper for Canadian PSTN Calls Anywhere

· 3 min read
Frank Chen
Frank Chen
Backend & Applied ML Engineer

I am developing a voice agent outside Canada. Without my Canadian SIM, staying connected via PSTN means I rely on VoIP softphones and Telnyx SIP trunking. In this guide, I’ll walk through how I set up two Canadian Telnyx numbers and used Zoiper on macOS and iOS to call between them—without needing PSTN compliance.

⚙️ 1. Telnyx Configuration​

🔐 Credential-Based SIP Connections​

I created two separate credential-based SIP Connections in the Telnyx console, each bound to a Canadian DID:

{
  "sip_trunk_connections": [
    {
      "connection_name": "livekit-trunk",
      "connection_type": "credential",
      "domain": "sip.telnyx.com",
      "username": "userfrankchen9081",
      "password": "YJhY0pg0",
      "numbers": ["+12495304098"]
    },
    {
      "connection_name": "originmind-callee",
      "connection_type": "credential",
      "domain": "sip.telnyx.com",
      "username": "userfrankchen8081",
      "password": "YJhY0pg0",
      "numbers": ["+12495304046"]
    }
  ],
  "telnyx_test_center_number": "+18004377950"
}