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HFP specs states both '=' and ':' should be accepted as a valid separator for +VGM and +VGS unsolicited result codes. This change is cherry-picked from Rodrigo Araujo's work here: https://lists.freedesktop.org/archives/pulseaudio-discuss/2017-September/028820.html Part-of: <pulseaudio/pulseaudio!521>
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