> Source: [sk92855](https://support.checkpoint.com/results/sk/sk92855)

# sk92855 - sip_tls_authentication Service does not traverse the Security Gateway

| Property | Value |
|----------|-------|
| Solution ID | sk92855 |
| Date Created | 2013-05-30 |
| Last Modified | 2016-08-31 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20 |
| OS | Linux, Gaia |

## Symptoms

- * No dropped connection shown in SmartView Tracker..
* No drops shown on kernel debugs.
* SIP over TLS connection does not reach destination.

## Cause

Service "sip_tls_authentication" is **not**supported for use on Security Gateways with version below R75.40VS.

In R75.40VS and above, there is partial support (see [R75.40VS VoIP Administration Guide](http://supportcontent.checkpoint.com/documentation_download?ID=16881)).

In R75.40VS and above, these predefined SIP services are available:

* TCP:sip_tls_authentication - Used for unencrypted SIP over TLS (that is, authenticated only). NAT is not supported for connections of this type.
* TCP:sip_tls_not_inspected - Insecure way of allowing SIP over TLS to pass without inspection.

For more information about SIP over TLS, see <https://www.dialogic.com/webhelp/BorderNet2020/2.2.0/WebHelp/sip_over_tls_ov.htm>

## Solution

This solution requires authentication. Please log in to view the full solution.

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