Asterisk translates 200 OK + SDP into 488 not acceptable here after both side agreed on codec.

Hi List

Asterisk 16.28.0 in use.

PJSIP in use
Two endpoints
Both using IPv6

One Endpoint on UDP, the other via TLS.

Both with:

t38_udptl=yes
;fax_detect=yes
;fax_detect_timeout=30
rtp_ipv6=yes

Both sides are T.38 capable and detect fax tone so no need for fax
detection on asterisk.

Voice calls between the two work fine.

But on a Fax call, I see this situation:

A <=> Asterisk <=> B

A: INVITE + Audio SDP => Asterisk => (same SDP) => B

B: 200 OK + Audio SDP => Asterisk => (same SDP) => A

* B Detects Fax-Tone!

B: Re-Invite + UDPTL => Asterisk => (same SDP) => A

A: 200 OK + UDPTL => Asterisk => 488 => B

I tweakted the udptl setting in various ways, but I am unable to figure
out, why Asterisk is sending a 488 to B, after it first happily
forwarded the SDP to A and got confirmation from A it was happy to
accept that DSP.

Any hint?

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