In theory you need to remove audio and then return it back. When you remove it from audio, it's on hold, and when you return it, you are back on.
The RFC5359 have an example of it: https://tools.ietf.org/html/rfc5359#section-2.1

On Wed, Sep 30, 2015 at 2:30 PM, Miha <miha@softnet.si> wrote:
Hi,

could someone help me with this. if it is possible to configure FS to
forward sdp with 0.0.0.0 which indicates "on hold"?

tnx
miha

On 29/09/2015 11:55, Miha wrote:
> Hi,
>
> how can I forward SDP that has indication of "hold" (sdp: c= 0.0.0.0). I
> need that FW forwards this SDP further and not change it to its ip?
>
> tnx
> miha
>
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