reuse UDP buffers when possible

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 92.50000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 82.03%. Comparing base (508d025) to head (a3f1c88).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
client_media.go	90.32%	3 Missing ⚠️
server_session_media.go	89.65%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #639      +/-   ##
==========================================
+ Coverage   82.01%   82.03%   +0.01%     
==========================================
  Files         116      116              
  Lines       11761    11805      +44     
==========================================
+ Hits         9646     9684      +38     
- Misses       1728     1733       +5     
- Partials      387      388       +1     

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