Is it permissible to complete the Maghrib prayer in performance upon hearing the 'Isha' call to prayer during the second rak'ah?

You must complete the prayer if you hear the call to another prayer while you are in the midst of it, and it is not permissible to interrupt an obligatory prayer except for a valid legal reason. Whoever catches one rak'ah or more of the Maghrib prayer before the red twilight disappears has performed it on time; otherwise, it is a make-up prayer. The time for Maghrib prayer is from sunset until the red twilight disappears. Whoever delays the prayer until its time has passed without a valid excuse is sinful. If part of the prayer falls within its time and part outside of it, the relied-upon view is that whoever catches a complete rak'ah within the time, then the entire prayer is considered performed on time; otherwise, it is a make-up prayer, based on the Prophet's (peace be upon him) saying: "Whoever catches one rak'ah of the prayer has caught the prayer."