Other SIP providers
Generic SIP-trunk setup that works with any provider supporting standard SIP signaling.
Don't see your provider in the list? Callina supports any SIP trunk that follows the standard signaling spec (RFC 3261 + companion RFCs). Configuration is the same regardless of vendor.
What you need from your provider
- SIP server / registrar URL (e.g.
sip.yourprovider.com) - SIP username + password (or, for IP-auth, your account's IP allowlist + Callina's egress IPs)
- Outbound port range (typically 10000–20000 UDP for RTP)
- Codec preference (G.711 PCMA / PCMU is universally supported; Opus on request)
Step 1 — Configure Callina
In Callina → Settings → SIP → Custom trunk:
- Provider: Custom.
- SIP server: from your provider.
- Username + password.
- Add Callina's egress IPs (shown in Settings → SIP) to your provider's allowlist if they require IP auth.
- Save.
Step 2 — Route a DID
In your provider's portal, route the DID you want Anna to answer at the new SIP user.
Step 3 — Test
Call the DID. Anna answers in under 3 seconds. If you see issues:
| Symptom | Likely cause |
|---|---|
| 403 on REGISTER | Wrong username format (some providers use <id>@<tenant>) |
| One-way audio | NAT traversal — enable Symmetric RTP in Callina trunk settings |
| Calls drop after 30s | Keep-alive too long — set to 30s |
| Caller ID empty | Enable PAI / P-Preferred-Identity in your provider's routing |
| 488 codec mismatch | Force G.711 PCMA-only in Callina |
Want a dedicated guide for your provider?
Email support@callina.ai — if your provider is in active use by other customers, we'll add a dedicated walkthrough within 5 business days.