## Sinch SDK Client Network Ports

The protocols and ports in the following table are necessary for the Sinch SDK Client to successfully make a call. This list should be used for reference for clients experiencing difficulties due to restrictive firewalls.

| Protocol | Port | Type | Usage |
|  --- | --- | --- | --- |
| TCP | 443 | Signalling | HTTP over TLS |
| UDP | 3478,19302 | Media | STUN / TURN |
| UDP | 49152-65535 | Media | S(RTP) ICE (STUN) |
| UDP | 49152-65535 | Media | S(RTP) ICE (STUN/TURN) |
| UDP | 10000-60000 | Media | (S)RTP |


## Sinch platform IP ranges

The following IP ranges may originate requests to your backend infrastructure (for example, Voice Callback API [events](/docs/voice/api-reference/callbacks)). If your firewall uses allowlists, ensure these ranges are permitted.

| Region | IP range |
|  --- | --- |
| APS1 | 13.201.195.96/27 |
| APSE1 | 13.213.166.0/25 |
| APSE2 | 3.26.105.64/26 |
| EUC1 | 3.68.81.128/25 |
| SAE1 | 15.228.118.128/26 |
| USE1 | 44.192.255.0/25 |
| USW2 | 18.246.82.128/27 |