on FP6.QREL.15.91.0, after a fresh install, I have no button to record a call (and I have the same issue on e/os 3.0.2 but less systematically)
Hi and welcome to the community forum 
Call recording is not available universally. For more info, see here:
In particular:
To record your phone calls:
- Your device must run Android 9 and up.
- You must have the latest version of the Phone app.
- You must be in a country or region where call recording is supported. Call recording is widely available, but not in all countries or regions. Features vary based on your country or region.
You may need to contact your network operator.
In which country did you perform the previous install?
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Alors ? On the road again ? 
Thanks for the welcome !
Yes sure … even if the country notion is fuzzy to me. Is it the country you’re physically in, the one you’re calling, the one your SIM is native?.. I do not think a phone behave differently depending on its location, it may behave differently regarding your carrier rather.
Installation was made in France with a french SIM.
What I should have precised is that I opened a gitlab issue on /e/OS for the same problem. The difference is I got the call record capability somehow (I can’t reproduce it now 
). As I got it once, I suppose this should be the normal behavior to have it…
I agree, it’s probably either the country of SIM issuer, or country you’re in at the moment, possibly a combination of both.
I don’t remember ever having seen a call record button in my stock Phone app.
Other methods are available, just search for “android record phone call” or whatever, but be aware of the local laws.
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Just as a reference, as call recording comes up from time to time with users sometimes unaware this could be illegal depending on the country …
Here’s a LineageOS 21.0 XML file which has all the relevant legal references per country for the decision to enable or disable call recording in the LineageOS 21.0 dialer … android_packages_apps_Dialer/java/com/android/dialer/callrecord/res/xml/call_record_states.xml at lineage-21.0 · LineageOS/android_packages_apps_Dialer · GitHub
Might be informative.
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@OldRoutard, I know other methods like rooting and the like and probably other dialers that could do the trick. But, as I said, this seems to be a “standard” feature at least in /e/OS under unclear circumstances, so I’m interested in the standard being applied. If it’s not possible, I will consider tricky ways but every non standard way has to be done forever on each OTA. See what I mean…
Thank you for your participation @AnotherElk. Lineage has validated call record for/from/? France, whatever that mean:
country iso=“fr,bl,gf,gp,mf,mq,nc,pf,pm,re,wf,yt” allowed=“true”
No, there are apps you can use which shouldn’t disappear every time you update your OS.
Interesting, I wonder why (consensual) call-recording could be illegal in any country. Kinda weird, isn’t it?
being the difficulty.
The recording tools often record calls by default from the start and there’s no way the other caller can know that the call is being recorded.
Okay, that makes sense. So disabling “autorecord” for certain countries would probably a better solution I guess.