<!-- Kamailio Pull Request Template -->

<!-- IMPORTANT: - for detailed contributing guidelines, read: https://github.com/kamailio/kamailio/blob/master/.github/CONTRIBUTING.md - pull requests must be done to master branch, unless they are backports of fixes from master branch to a stable branch - backports to stable branches must be done with 'git cherry-pick -x ...' - code is contributed under BSD for core and main components (tm, sl, auth, tls) - code is contributed GPLv2 or a compatible license for the other components - GPL code is contributed with OpenSSL licensing exception -->

#### Pre-Submission Checklist <!-- Go over all points below, and after creating the PR, tick all the checkboxes that apply --> <!-- All points should be verified, otherwise, read the CONTRIBUTING guidelines from above--> <!-- If you're unsure about any of these, don't hesitate to ask on sr-dev mailing list --> - [x] Commit message has the format required by CONTRIBUTING guide - [x] Commits are split per component (core, individual modules, libs, utils, ...) - [x] Each component has a single commit (if not, squash them into one commit) - [x] No commits to README files for modules (changes must be done to docbook files in `doc/` subfolder, the README file is autogenerated)

#### Type Of Change - [x] Documentation.

#### Description A) offers OPUS + PCMU

B) answers PCMU

I do not want PCMU to be selected, I would like to endup transcoding : ``` A <-opus-> rtpengine <-pcmu-> B ``` If I understand correctly, this is what I have to set on the rtpengine_offer ``` codec-mask=opus codec-strip=PCMU codec-transcode=PCMU ``` rtpengine is removing opus from the offer before sending it.

The answer sent by rtpengine is as follows: ``` m=audio 10884 UDP/TLS/RTP/SAVPF 0 126 a=maxptime:150 a=mid:0 a=rtpmap:0 PCMU/8000 a=rtpmap:126 telephone-event/8000 ``` for this to work, I would expect rtpengine to insert opus and remove pcmu ?

Answer : ``` That's what 'codec-accept` is for

Try with `codec-accept-opus` and/or `opus-accept-opus/48000` in the offer. That should be all that's needed (assuming reasonably recent version).

```

You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/3381

-- Commit Summary --

* rtpengine: doc add codec-accept with an example

-- File Changes --

M src/modules/rtpengine/doc/rtpengine_admin.xml (33)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/3381.patch https://github.com/kamailio/kamailio/pull/3381.diff