why incoming calls become missed calls in a single ring before I attend

[srithamizh]

Whenever a call. Comes immediately becomes missed call in single ring though I try to attend. Immediately

[Thommo]

Check your call settings to see if you have applied a setting to forward calls to voicemail etc however you could try performing an app preferences reset

Settings then Apps then tap the 3 dots then reset app preferences then reboot and test but take note that this will also reset your ringtone etc back to factory default