i noticed that sems master version adds two

a=direction:passive

lines to its 200 ok.

invite has

v=0.
o=- 4120417818 922721318 IN IP4 192.168.0.146.
s=-.
c=IN IP4 192.168.0.146.
t=0 0.
a=tool:baresip 0.4.3.
m=audio 14004 RTP/AVP 96 97 98 99 100 101 8 0 102.
b=AS:125.
a=rtpmap:96 SILK/24000.
a=rtpmap:97 SILK/16000.
a=rtpmap:98 speex/16000.
a=fmtp:98 mode="7";vbr=off;cng=on.
a=rtpmap:99 SILK/12000.
a=rtpmap:100 SILK/8000.
a=rtpmap:101 speex/8000.
a=fmtp:101 mode="7";vbr=off;cng=on.
a=rtpmap:8 PCMA/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:102 telephone-event/8000.
a=fmtp:102 0-15.
a=sendrecv.
a=label:1.
a=ptime:20.
a=direction:active.

and reply has

v=0.
o=sems 71258383 2058863947 IN IP4 192.98.102.10.
s=sems.
c=IN IP4 192.98.102.10.
t=0 0.
m=audio 40000 RTP/AVP 96 97 99 100 98 101 8 0 102.
a=rtpmap:96 SILK/24000.
a=rtpmap:97 SILK/16000.
a=rtpmap:99 SILK/12000.
a=rtpmap:100 SILK/8000.
a=rtpmap:98 speex/16000.
a=fmtp:98 mode="7";vbr=off;cng=on.
a=rtpmap:101 speex/8000.
a=fmtp:101 mode="7";vbr=off;cng=on.
a=rtpmap:8 PCMA/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:102 telephone-event/8000.
a=fmtp:102 0-15.
a=direction:passive.
a=sendrecv.
a=direction:passive.

probably it does not matter anything, but in principle one would be
enough.

-- juha
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