Which phone are you using? I have the Pixel 2, and touch wood, it's been decent almost every time (except for a few random instances).The call connection time is probably done in ideal conditions, since Jazz usually takes significantly longer than that for me.
Just today I was in Builders Mall on GT Road, the 3G signal was poor, and it took over 8 seconds for the call to connect. Dropped to 2G halfway through and as expected, the quality was terrible.
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