asterisk users - May 2019 - Change of H264 profile level problem

Hello,

Can anyone help with an issue regarding the H264 profile level being passed
through Asterisk? We have a video call like this:

Caller A -> Asterisk -> Called B

Caller A's INVITE SDP offers "profile-level-id=42801f", and Called
B
replies a 200 OK containing "profile-level-id=42801e" in its SDP. 
Note
that this ends with an 'e' rather than an 'f'. The problem is
that Asterisk
forwards the 200 OK to Caller A with "profile-level-id=42801f" in the
SDP,
so not what Called B sent. Caller A then starts transmitting video in a
resolution that Called B can't handle, and the video is displayed as blank.

My question is, since Asterisk doesn't do video transcoding, why doesn't
it
pass though Called B's "profile-level-id=42801e" unchanged? If it
did then
Caller A might use a resolution that Called B can handle. We are using
Asterisk 11.25.3.

Thanks in advance for any assistance.

-- 
David Cunningham, Voisonics Limited
http://voisonics.com/
USA: +1 213 221 1092
New Zealand: +64 (0)28 2558 3782
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