[SR-Users] Modify session name in SDP

[ZZ Wave]

Hello.

Kamailio 5.2.1, Debian 10.

I need to change session name (s=) in SDP before relaying it to next hop,
and for unknown reason I can't do it with virtually any TEXTOPS function,
everything replace*, subst*, *body*... For example this from TEXTOPS
documentation:

subst_body('/^s=(.*)/s=root/')

just before 'final' t_relay().

Either Kamailio just adds "s=root" to SDP leaving first "s=" intact, or
adds just "root", or does nothing.

Also I've tried msg_apply_changes() before and after these manipulations,
still no result.

Is it possible to make this in Kamailio without source code modification?
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