> ## Documentation Index
> Fetch the complete documentation index at: https://help.optua.co.uk/llms.txt
> Use this file to discover all available pages before exploring further.

# TLS Certificate

We support TLS to enable fully secure calling from your platform to us.\
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Although we do not recommend certificate pinning as we may make changes to our certificates during maintenance, please find a copy of the current public certificate for *.*[*intervoip.co.uk*](http://intervoip.co.uk)\_ attached.\
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Note: This certificate is valid until Oct 16, 2023. A new certificate will be available here when the current one is renewed.\
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[<u>.intervoip.crt</u>](https://cdn.controlpanel.work/downloads/voip/intervoip.crt)\
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Alternatively you can get the certificate using the following openssl command:\
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openssl s\_client -connect sip54.intervoip.co.uk:5061 2>/dev/null