[stable4.7] fix: make call token extraction more robust

[backportbot]

Backport of PR #6253

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 15.51%. Comparing base (7eab677) to head (7ddd9aa).
Report is 1 commits behind head on stable4.7.

Files	Patch %	Lines
src/services/talkService.js	66.66%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           stable4.7    #6254      +/-   ##
=============================================
+ Coverage      15.49%   15.51%   +0.01%     
=============================================
  Files            206      206              
  Lines           9254     9256       +2     
  Branches        1930     1931       +1     
=============================================
+ Hits            1434     1436       +2     
  Misses          7820     7820              

Flag	Coverage Δ
javascript	15.51% <66.66%> (+0.01%)	⬆️

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