SIP provider overview
Connect Callina to your existing PBX or SIP trunk via standard SIP signalling.
Callina speaks standard SIP — any provider that supports outbound trunking with a public IP allowlist works. The pages below cover the most common DACH/EU providers with screenshots and exact field mappings.
Common requirements
| Field | Where to get it |
|---|---|
| SIP server | From your PBX / trunk provider |
| Username | SIP user in your PBX |
| Password | Password for that SIP user |
| IP allowlist | Add Callina's egress IPs (in Settings → SIP) |
| Codec | G.711 (PCMA / PCMU) — Opus on request |
| DTMF | RFC 2833 / RFC 4733 |
Tested integrations
If your provider isn't listed, the standard configuration in Settings → SIP → Custom trunk works with most providers — drop us a line at support@callina.ai if you'd like us to add a dedicated guide.