[OpenSIPS-Users] 403 Rely forbidden

[info at vintageelectronics.ca]

Getting this error from Jitsi when sending text messages or trying to 
place a voice call between the registered contacts:
>
>  The above message could not be delivered
> A network problem occurred. Please check your network configuration 
> and try again. Error was: 403 Rely forbidden
>

What is Rely and what does that error mean?

Thank you!

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