# Miscellaneous

## Minimum Requirements

When using the JavaScript SDK on desktop, we recommend using the latest browser version. The table below shows the SDK feature compatibility with various browsers. Note that Push Notifications support in a browser is necessary for the JS SDK to work.

| Feature | Chrome | Firefox | Safari | Android Chrome - 110.0.5481.65 | Android Firefox - 110.0.1 | Safari on iOS |
|  --- | --- | --- | --- | --- | --- | --- |
| Push Notifications | ✅ | ✅ | ➖ | ✅ | ➖ | ➖ |
| Audio and Video | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |


The table below shows browser support for each type of demo available in [Sinch RTC Reference Applications](https://github.com/sinch/rtc-reference-applications):

| Demo type | Chrome | Safari | foldername |
|  --- | --- | --- | --- |
| In-app voice | ✅ | ➖ | voicecall |
| In-app video | ✅ | ➖ | videocall |
| In-app voice to phone | ✅ | ✅ | callnumber |
| In-app voice to SIP | ✅ | ✅ | callsip |


## Restrictions on User IDs

User IDs **must not** be longer than **255** bytes, **must** only contain URL-safe characters, and be restricted to the following character set:


```text
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghjiklmnopqrstuvwxyz0123456789-_=
```

If you need to use *User IDs* containing characters outside the allowed set above, you could consider *base64*-encoding the raw *User IDs* using a URL-safe base64 alphabet as described in [https://tools.ietf.org/html/rfc4648#section-5](https://tools.ietf.org/html/rfc4648#section-5). Note how the allowed character set overlaps with the URL-safe base64 alphabet, but doesn't allow characters in the **non**-URL-safe alphabet, for example `/` (forward slash) and `+` (plus sign).

## Encryption Export Regulations

Please check the Summary of U.S. Export Controls Applicable to Commercial Encryption Products and ensure that the application is registered for the Encryption Regulations, if applicable. It can be found under this [link](https://www.bis.doc.gov/index.php/policy-guidance/encryption).

## Statistics

The Sinch SDK client uploads statistics to the Sinch servers at the end of a call, a call failure, or a similar event. The statistics are used for the monitoring of network status, call quality, and other aspects regarding the general quality of the service.

Some of the information **is not** anonymous and may be associated with the User ID call participants.

The statistics upload is done by the client in the background.

## Third-Party libraries and Copyright Notices

All Third Party Libraries and Copyright notices can be found under this [link](https://www.sinch.com/terms-of-service/).