Mail notifications during calls

[c_codrut]

Is there a way to stop incoming mail notifications when i am using my phone for voice calls?
I would like to get notified, but only with a vibration during calls and not with sound which is very annoying for my ear.
Maybe I missed an option in settings....
My phone is a Huawei Mate 9.
Thank you.

[Kostya Vasilyev]

Not that I know of.

Aqua Mail doesn't even have the permission to know if there is a phone call.

This never came up before, maybe other phones automatically suppress notification sounds when there is a voice call? I seriously don't happen to know.

[c_codrut]

Thank you Kostya for your answer,
I guess you are right, it works different for other phones, for example Oneplus 3T is only vibrating for incoming notifications during calls, but for all notifications not only Aqua Mail.
Huawei Mate 9 notifies with sound too, but again for all aplications and not only for Aqua Mail, so there must be a phone manufacturer android development issue and a setting that is not available for end user to change.
Anyway is not a big deal, i can live with it.
Kind regards,