# SIP connection

Everything a SIP client needs to call through Vonyx.

## Connection details

| Setting | Value |
| --- | --- |
| SIP server | `43.204.9.41` |
| Port | `5060` |
| Transport | UDP or TCP |
| Authentication | Username and password (digest), from your [trunk](/docs/console/sip-trunks) |
| Codecs | G.711 μ-law (PCMU), G.711 A-law (PCMA) |
| RTP ports | `10000–20000` (UDP) |
| Caller ID | One of your Vonyx numbers |
| Number format | Outbound: `91XXXXXXXXXX` or `+91XXXXXXXXXX`. Inbound: Vonyx sends `91XXXXXXXXXX`. |

## Firewall

Allow traffic to and from `43.204.9.41`:

- SIP on port `5060`, UDP or TCP
- RTP on UDP ports `10000–20000`

For [inbound calls](/docs/console/inbound-calls), your server must accept SIP from `43.204.9.41`.

## Not available yet

- DTMF (keypad tones)
- Call transfer (SIP REFER)