Call waiting service is enabled . But not getting calls during calls.

[VEL_ASSA]

Please tell us some basic information before asking for help:
Model Name:MAX PRO M1
Firmware Version: ANDROID 9 &10 BETA 1,2
Rooted or not: ÑO
Frequency of Occurrence: ALWAYS
APP Name & APP Version (If your issue relates to the app): CALL WAITING Service only on BSNL.
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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My BSNL 4G SIM not working call waiting service in ASUS ZENFONE MAX PRO M1.
HOW TO FIX THIS ISSUES.

[VEL_ASSA]

Problem solved .

[VEL_ASSA]

BSNL call waiting problem solved.

[gauravsikhwal]

Please check Call waiting notification tone during call.

Is this a normal beep sound or it is annoying tring tring sound.

Are you able to hear voice of current caller during you get a waiting call alert tone.

[dishantpjain]

Call waiting issue. I can't get notifications of call waiting or missed call, however caller is getting a busy notification when I was on call.