Could someone tell me how the word /telephoning/ is pronounced with the stress made clear?
Short answer: /tel e phon ing/.
Slightly longer answer: primary stress goes on /tel/, and there is secondary stress on /phon/.
Contextual addendum: /telephoning/ is not used in conversation, in my experience: /phoning/ is used instead. (I'd give you the IPA transcription, but I'm not sure whether it would render properly here)