Thanks for that clarification - this is what I observed ;-)

From this description in the module's documentation:

TOS=... - change the IP TOS value for all outgoing RTP packets within the entire call in both directions. Only honoured in an “offer”, ignored for an “answer”. Valid values are 0 through 255, given in decimal. If this option is not specified, the TOS value will revert to the default TOS (normally 184). A value of -1 may be used to leave the currently used TOS unchanged.

Resp. also from the source-comment in daemon/calls.c:

/* Handle TOS= parameter. Negative value = no change, not present or too large =
 * revert to default, otherwise set specified value. We only do it in an offer, but
 * then for both directions. */

I interpreted "no change" as "as received".

What is then actually the difference between negative value ("no change") and > 255 "revert to default"? Both result in the same default?

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