Handle cancellation of inbound calls.

[dennwc]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 33.89831% with 39 lines in your changes missing coverage. Please review.

Project coverage is 66.33%. Comparing base (31cd233) to head (68d7254).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/sip/inbound.go	27.77%	39 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #176      +/-   ##
==========================================
- Coverage   66.75%   66.33%   -0.42%     
==========================================
  Files          49       50       +1     
  Lines        5101     5659     +558     
==========================================
+ Hits         3405     3754     +349     
- Misses       1390     1571     +181     
- Partials      306      334      +28     

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