According to the code, both rfc2543 and rfc3264 are handled.
Just tested this out with jitsi and it's working fine.
Can you provide a sample of your tests?

Regards,
Ovidiu Sas

On Tue, Oct 24, 2017 at 9:52 AM, Julia Boudniatsky <juliabo@gmail.com> wrote:

> FYI,
>
> After some tests found, that function "is_audio_on_hold()" (textops)
> supports only rfc 2543,
> where "hold"  is indicated by setting  the "c" destination  addresses for
> the media streams to zero  (0.0.0.0).
> The newest rfc3264, where "hold" is indicated by a=sendonly/inactive, is not
> supported.
> Kamailio version 4.4.6.
>
> Best regards,
> Julia
>
>

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